I’m just trying to understand the use case for this…
Are you trying to add posters showing tiny sequences of the movie (like a mini-trailer in the poster) or have an animated logo flying around the poster itself?!
I just imagined a poster wall with each poster blinking and flashing. Previously I was quite happy that this was mostly gone from the internet (remembering the flashy/blinky late '90s and early 2000s) 
Edit:
oh… and there actually is a feature suggestion for animated posters…
