I don't have any sources, I only know how it has been implemented by various companies. Pentax, for example, offers some very powerful zoom lenses for CCTV cam

I don't have any sources, I only know how it has been implemented by various companies. Pentax, for example, offers some very powerful zoom lenses for CCTV cameras. They have an image stabilizer box that goes between the cameras output, and the viewing device. That box picks 4 points in the video and uses those 4 points as its reference. If you zoom in or out, the points move diagonally in unison. Any other movement left/right/up/down indicates camera shake and is compensated for. To do this, you have to start with an image that is slightly scaled down or cropped so that you have have some buffer room all around the frame.