[Cin] Tracking (or tracer?) control points

Hi all! In the video (watch from 1:13): https://www.youtube.com/watch?v=3kzKhedIX1o shows how a clip is inserted into a chromakey area. I looked at the Tracer effect in Cinelerra-gg, but I still did not understand whether it was possible to perform a similar task with it. If there are no such instruments in Cinelerra-gg - maybe try to adapt the Motion effect to the task? I think solving this issue will add cinelerra-gg even more professionalism. For information: in Adobe After Effects,Screen Replacement & Motion Tracking solves this problem. Example: https://www.youtube.com/watch?v=JJmvrNmso5Y -- Ugin