Ok... but you can make your shape layer to react in almost unlimitles ways because you can asign shape layer to any parameter that is avaliable in shape layer, but in a videoclip (that is already rendered and have hist start, middle and end - you can make that clip only react with whatever that it have avaliable so on most basic way just position, anchor point, scale, rotation, opacity so please clarify what kind of a reaction do you expect from your videoclip?
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