How to use vanilla entity shaders (SOLVED)

I was wondering if anyone could tell me how can I make it so that the vanilla entity shaders (the ones visible by getting into some entities' POV in spectator mode) are visible to the player when they perform a certain action, get a certain effect, or equip a certain armor piece. 

Help would be appreciated.

EDIT: just figured I didn't even look around myself before making this post, and there's a plugin for doing this.