Chromakey filtering in ARKit - or some other way to remove a green screen

I am able to play a video on a plane in ARKit. But, I need to remove its background, presumably using a chromaKey technique. how do I do that? I have spent more time than is reasonable searching the docs and the internet, but to no avail. ChatGPT useless of course.

Surely it is doable; even the react native library for ARKit has it.

Chromakey filtering in ARKit - or some other way to remove a green screen
 
 
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