I've got a locked off camera that has people walking in front of it. Just wondering if there is a way to remove all the "constant pixels" using the original clear background image/video as a reference on what to remove from the video. Only leaving the moving people.
You can try if you have a clean plate--meaning that you have the locked off shot with nothing in it. But it usually doesn't work out the way you expect--subtle color changes between frames and the moving people probably have similar colors compared to the background so they won't key out perfectly.