This is a test of overlaying a video on top of a video, tracking a placard I'm holding up.
This was done in DaVinci Resolve 16 (the free version), using the Fusion tab and the Tracker tool. Definitely not for the faint of heart (getting it to work, not the content).
Holy crap, it took 8 hours to figure out how to do this and execute it.
For a Step-by-step How-to, visit Road Reality: http://www.road-reality.com/2020/10/2...