An app that allows you to choose which colors to key out to make e.g. the background of a video transparent. This would be cool to be able show off apps in a more flexible way on the web, etc.
I'm imagining something in this direction: https://transparentvideo.app Turns out these videos don't actually play on the web, so maybe this isn't doable at all :/
However, thinking one step further: What if "transparent background" was simply a setting in the in-shell recorder?