It depends on the app you use. The app "Chromavid" can also take photos: https://play.google.com/store/apps/details?id=com.appsformobs.chromavid&hl=de_CH&gl=US
The green/bluescreen technique is very common and much used in film and television production and has also found its way into video call and conference software.
https://de.wikipedia.org/wiki/Bluescreen-Technik
Unfortunately, there is too much software to list now.
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