You can summon a Camel without any mod or resource pack using the command below.

To spawn a Camel, you have to obtain a Camel Spawn Egg. You have to throw a brown dye and an egg to the ground to make a Camel Spawn Egg or right-click on the sign on the side of the command box that is written: "[​GIVE EGG]".

Watch on Youtube: https://youtu.be/LskS6JdoMBk
Official command: https://torchcraftyt.github.io/Commands/Camel.html
Command on JustPaste.it: https://justpaste.it/camel-TC

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Triple-click to select all the commands then right-click and choose copy. Next, get in your world, and give yourself a command block (using /give @s command_block). Paste the command in the command block (using Ctrl+C or Cmd+C). Finally, place a Redstone block next to the command block.

Command: (triple-click to select all)
summon minecraft:falling_block ~ ~1 ~ {BlockState:{Name:"redstone_block"},Time:1,Passengers:[{id:villager,Health:0,Passengers:[{id:falling_block,Time:1,BlockState:{Name:"activator_rail"},Passengers:[{id:command_block_minecart, Command: 'gamerule commandBlockOutput false'},{id:command_block_minecart, Command: '/scoreboard objectives add camelID dummy'},{id:command_block_minecart, Command: '/team add noCollision'},{id:command_block_minecart, Command: '/team modify noCollision collisionRule never'},{id:command_block_minecart, Command: '/fill ~1 ~-2 ~0 ~8 ~-2 ~3 minecraft:sandstone'},{id:command_block_minecart, Command: '/fill ~1 ~1 ~0 ~8 ~1 ~3 sand'},{id:command_block_minecart, Command: '/fill ~8 ~0 ~3 ~1 ~-1 ~0 minecraft:white_stained_glass'},{id:command_block_minecart, Command: '/setblock ~0 ~1 ~1 minecraft:birch_wall_sign[facing=west,waterlogged=false]{Color:"white",GlowingText:1b,Text1:\'{"text":"CAMEL"}\',Text2:\'{"text":"COMMAND BOX"}\',Text3:\'{"text":""}\',Text4:\'{"text":""}\'}'},{id:command_block_minecart, Command: '/setblock ~0 ~1 ~2 minecraft:birch_wall_sign[facing=west,waterlogged=false]{Color:"white",GlowingText:1b,Text1:\'{"text":"made by"}\',Text2:\'{"text":"TorchCraft"}\',Text3:\'{"text":""}\',Text4:\'{"text":""}\'}'},{id:command_block_minecart, Command: '/setblock ~0 ~0 ~1 minecraft:oak_wall_sign[facing=west,waterlogged=false]{Color:"black",GlowingText:0b,Text1:\'{"color":"dark_blue","clickEvent":{"action":"run_command","value":"give @s llama_spawn_egg{EntityTag:{id:armor_stand,Tags:[camel-spawner]},display:{Name:\\\'[{\\\\"text\\\\":\\\\"Camel Spawn Egg\\\\",\\\\"italic\\\\":false}]\\\'}} 1"},"text":"[GIVE EGG]"}\',Text2:\'{"text":""}\',Text3:\'{"text":""}\',Text4:\'{"text":""}\'}'},{id:command_block_minecart, Command: '/setblock ~0 ~0 ~2 minecraft:oak_wall_sign[facing=west,waterlogged=false]{Color:"black",GlowingText:0b,Text1:\'{"color":"dark_red","clickEvent":{"action":"run_command","value":"fill ~ ~-2 ~1 ~8 ~1 ~-2 air"},"text":"[UNINSTAL]"}\',Text2:\'{"text":""}\',Text3:\'{"text":""}\',Text4:\'{"text":""}\'}'},{id:command_block_minecart, Command: '/setblock ~2 ~0 ~2 minecraft:repeating_command_block[conditional=false,facing=east]{Command:"/execute as @e[tag=camel-control] at @e[tag=camel-head] if score @s camelID = @e[limit=1,distance=0] camelID run tp @s ~ ~ ~ ~ 0",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~3 ~0 ~2 minecraft:chain_command_block[conditional=false,facing=east]{Command:"/execute as @e[tag=camel-body] at @e[tag=camel-control] if score @s camelID = @e[limit=1,distance=0] camelID run tp @s ^ ^ ^-1 ~ -90",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~4 ~0 ~2 minecraft:chain_command_block[conditional=false,facing=east]{Command:"/execute as @e[tag=camel-head] store result entity @s Rotation[0] float 0.00001 run data get entity @s Rotation[0] 100000",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~5 ~0 ~2 minecraft:chain_command_block[conditional=false,facing=east]{Command:"/execute as @e[tag=camel-head] at @s unless entity @e[tag=camel-body,distance=..2] run kill @s",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~6 ~0 ~2 minecraft:chain_command_block[conditional=false,facing=north]{Command:"/execute as @e[tag=camel-body] at @s unless entity @e[tag=camel-head,distance=..2] run kill @s",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~7 ~0 ~2 minecraft:chain_command_block[conditional=false,facing=up]{Command:"execute as @e[tag=camel-spawnegg] at @s run tag @s remove camel-spawnegg",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~2 ~0 ~1 minecraft:repeating_command_block[conditional=false,facing=east]{Command:"/execute as @e[tag=camel-head] at @s if data entity @p[distance=..1] RootVehicle.Entity{Tags:[camel-head]} store result entity @s Motion[0] double 0.00001 run data get entity @p Motion[0] 2000000",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~3 ~0 ~1 minecraft:chain_command_block[conditional=false,facing=east]{Command:"/execute as @e[tag=camel-head] at @s if data entity @p[distance=..1] RootVehicle.Entity{Tags:[camel-head]} store result entity @s Motion[2] double 0.00001 run data get entity @p Motion[2] 2000000",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~4 ~0 ~1 minecraft:chain_command_block[conditional=false,facing=east]{Command:"/execute as @e[tag=camel-head] at @s if data entity @p[distance=..1,nbt=!{Motion: [0.0d, -0.0784000015258789d, 0.0d]}] RootVehicle.Entity{Tags:[camel-head]} run data modify entity @s Rotation[0] set from entity @p Rotation[0]",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~5 ~0 ~1 minecraft:chain_command_block[conditional=true,facing=up]{Command:"/execute as @e[tag=camel-head] run data modify entity @s ChestedHorse set value 0b",auto:1b,conditionMet:0b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~6 ~0 ~1 minecraft:chain_command_block[conditional=false,facing=north]{Command:"/execute as @e[tag=camel-control] at @s unless entity @e[tag=camel-head,distance=..2] run kill @s",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~7 ~0 ~1 minecraft:command_block[conditional=false,facing=up]{Command:"subscribe to TorchCraft",auto:0b,conditionMet:0b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~2 ~-1 ~2 minecraft:repeating_command_block[conditional=false,facing=east]{Command:"execute at @e[tag=camel-spawner] run summon minecraft:llama ~ ~ ~ {Variant:0,Tags:[camel-head,camel-new],Tame:1}",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~3 ~-1 ~2 minecraft:chain_command_block[conditional=true,facing=east]{Command:"execute at @e[tag=camel-spawner] run summon minecraft:llama ~ ~ ~ {Variant:0,Tags:[camel-body,camel-new],Tame:1,Team:noCollision,Strength:5}",auto:1b,conditionMet:0b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~4 ~-1 ~2 minecraft:chain_command_block[conditional=true,facing=east]{Command:"execute at @e[tag=camel-spawner] run summon minecraft:armor_stand ~ ~ ~ {Invulnerable:1,Invisible:1,Tags:[camel-new,camel-control]}",auto:1b,conditionMet:0b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~5 ~-1 ~2 minecraft:chain_command_block[conditional=true,facing=east]{Command:"kill @e[tag=camel-spawner]",auto:1b,conditionMet:0b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~6 ~-1 ~2 minecraft:repeating_command_block[conditional=false,facing=north]{Command:\'/execute as @e[type=item,nbt={Item:{id:"minecraft:egg"}}] at @s if entity @e[type=item,distance=..1,nbt={Item:{id:"minecraft:brown_dye"}}] run tag @s add camel-spawnegg\',auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~7 ~-1 ~2 minecraft:chain_command_block[conditional=false,facing=up]{Command:\'/execute as @e[tag=camel-spawnegg] at @s run kill @e[type=item,limit=1,distance=..1,nbt={Item:{id:"minecraft:brown_dye"}}]\',auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~2 ~-1 ~1 minecraft:repeating_command_block[conditional=false,facing=east]{Command:"execute as @e[tag=camel-new] run scoreboard players operation @s camelID = .index camelID",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~3 ~-1 ~1 minecraft:chain_command_block[conditional=true,facing=east]{Command:"tag @e[tag=camel-new] remove camel-new",auto:1b,conditionMet:0b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~4 ~-1 ~1 minecraft:chain_command_block[conditional=true,facing=east]{Command:"scoreboard players add .index camelID 1",auto:1b,conditionMet:0b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~5 ~-1 ~1 minecraft:repeating_command_block[conditional=false,facing=up]{Command:"/execute as @e[tag=camel-head] if data entity @s {ChestedHorse:1b} at @s run summon minecraft:item ~ ~ ~ {Item:{id:chest,Count:1},Motion:[0d,.4d,0d]}",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~6 ~-1 ~1 minecraft:chain_command_block[conditional=false,facing=east]{Command:\'execute as @e[tag=camel-spawnegg] run data modify entity @s Item set value {id:"minecraft:llama_spawn_egg",Count:1b, tag:{EntityTag:{id:armor_stand,Tags:[camel-spawner]},display:{Name:\\\'[{"text":"Camel Spawn Egg","italic":false}]\\\'}}}\',auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: '/setblock ~7 ~-1 ~1 minecraft:chain_command_block[conditional=false,facing=south]{Command:"/execute as @e[tag=camel-spawnegg] at @s run particle minecraft:happy_villager ~ ~.3 ~ 0.1 0.1 0.1 1 10 normal",auto:1b,conditionMet:1b,powered:0b}'},{id:command_block_minecart, Command: 'setblock ~ ~1 ~ command_block{Command:"fill ~ ~ ~ ~ ~-3 ~ air",auto:1}'},{id:command_block_minecart, Command: 'kill @e[type=command_block_minecart,distance=..1,tag=!debug]'},]}]}]}