Virtual green screen for livestreaming

[nicopace]

Tools like OpenBroadcaster Studio use the green screen effect to add overlays on the video.
If you could use black text over green background that would enable this to be used by thousands of livestreamers.

Like in here: https://www.youtube.com/watch?v=B7DWWFVRteo

[nicopace]

It seems this people are also doing it: https://caption.ninja/