How to implement 2D cutscenes(mp4s) into my game?

I have 2 cutscenes I want to implement into my 2d side scroller game project but they’re going to be 2d animated in another program, how would I import my cutscenes? and then set it up so one plays at the beginning and how I can trigger one to start playing once the player character collides with a box trigger?

thanks in advance for any advice/help