I'm making a project in which I'm required to replace a motion-tracked object with its background. Basically what I want is this :
So how do I motion track a mask in this way ? I was able to link the mask to the motion-tracking data (stored in the null object) but for some reason, the entire background video was dancing through the mask (probably because the mask and the layer are inseparable). Am I doing anything wrong ?
Any help appreciated
Apply the masking to solids on top of the layer, assign them as track mattes and link the tracker data to the position of the track matte. Indeed masks cannot be tracked directly in AE...