I'm trying to throw together some short form/tiktok style videos. However, I want to record them and then add green screen effects afterwards. I don't use an actual green screen, I like to use a filter like on Instagrams camera. The problem is, you can use this filter on Instagram on an already recorded video, but the UI won't allow you to select the media to replace the green color with. So, my question is, which camera or filter app allows this -- adding a "green screen" filter to an already recorded video, and selecting the media to replace the green with? Thanks!