Stabilize and crop out


how can I track stabilize a mouth. and then crop it out from a face?


You can track and stabilize using Mocha Pro. Create a track shape for the mouth, choosing the track options will affect the motion you want to stabilize. For example for some tasks, you might just want to stabilize position, rotation and scale (vs full perspective).

After the mouth is tracked, you can use the stabilize module and choose Maximum Smoothing to lock the motion down:

Also note, if you want to lock down the organic motion of the mouth itself, the PowerMesh stabilze workflow is designed for this: Boris FX | Videos