Cropping shape of movie into a circle

Hi, I am trying to play only a circle shape of my movie and not sure where to start… my overall basic concept right now is that when i zoom into a sphere the movie is inside playing in the center in the shape of a circle. My first idea is that maybe I could just make some kind of loop that gathers and displays only the pixels within a circle of the full physical size of the movie. any ideas or help would be greatly appreciated. thank you!

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thank you this is helpful, also realized after asking that someone else asked almost the same question and im looking at that too. got this to work though so thank you!