in my video editing program i can't figure out how to export text or other stuff, and then reimport it, but with the ability to overlay it over other stuff without it just putting it's own background on top of everything else.  does this make sense?  it would be very time consuming to, like, try to mask it all.  i feel like i am missing a setting or feature?
key. it's called a color key. it's like what they do on the weather report. the person is standing in front of a green screen, then they put that footage on top of the map, and then zap out the green. "key out" the green. it's called color keying. hopefully your program has it. if it doesn't, ......... then .... get one that does! yours probably does. it comes in cereal boxes these days. but you don't have to use green. when i use text, the original images are all white text on black back. i have key out black saved as a favorites setting, so i do that and then who knows maybe change the color from there but the background is already gone