When stacking videos on the timeline, is it possible to cut a free form window (sort of like a mask) into the primary video so that a video behind it will be seen? This is different from the size/position function where a video frame can be positioned on the primary video or increasing the transparency of stacked videos so they can all be seen. In my situation, I have a primary video of a work table with various items on it. I want to cut out some of the table top to show another video (i.e. beneath the table.) The primary video was not shot with green screen technique.
Thanks.