Description: This plugin takes 3 sequence strips as inputs.
Description: It uses the 3rd strip as a mask for the first two.

Author: Excellent Whale
Email: joeri@blender.nl
Website: http://home.iae.nl/users/exwhale/joeri.html
License:


(i.e. where its white on the 3rd strip it takes pixels from the
first strip, where it isn't it takes pixels from the second strip)

Last tested with blender 2.10 beta