OK, what I was looking for is the same effect applied to video.
I want to take a video and then zoom in on a portion of frame, say a face, and follow the face as it walks across the screen using keyframes to redeposition zoomed area. This is what is done in magic motion on a still frame.
I know how to use the blur effect to do this, but with zoom in I can not see any way to reposition the zoomed image within the frame . Seems like it just zooms in and the center of the image stays at same place.