I've been looking everywhere to try to figure this out. I am trying to figure out how to make a video transition where the background changes before everything else. Is this just done with a mask?
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Yes. It's a very fast transition so depending on the footage you can also try using a luma key or some kind of color key for a rough matte. Your favorite software package is? – p2or Jun 14 '16 at 18:54
According to the comments on that page, it is rotoscoped - which is (from Wikipedia)
the technique of manually creating a matte for an element on a live-action plate so it may be composited over another background.
