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Video with Alpha Channel

I've been having a blast with the Vuforia/Unity AR assigning videos to still printed images, example:

https://tfustudios.tumblr.com/post/167536550123

But I've mostly been working with  squares and rectangles.

Is there an method of using say, a circular video ( with an alpha channel) to odd shaped objects? Basically, adding AR video to a circular sticker?

Thanks!