Big shoutout to Ticxo! He's a developer of a plugin called PlayerAnimator, which is implemented in PlayerEmotes. Because of his project, this plugin can exist! ^^
PLAYEREMOTES PlayerEmotes is a plugin that make the interaction between players way more fun! You can make whatever player animations you want and as many as you want!
How does it work? The plugin uses Resource Pack that allows to make this kind of magical stuff. There are spawned holograms using packets that are moving and having player skulls on themselves. Using Resource Pack the skulls are remodelled and use the player's skin.