at this app you all you have to do is picking up a cool backgroung when you video chat with your friends. 
then turn on the green screen on your phone or tablet.

green screen can be for zoom or other video app.
you can prank your friends and make funney video chat with them as example:
put a background of another person or alien at the background, and with your green screen you can change your face while video chatting.
this app makes your screen become green, and with funny background you can prank your friend while zooming.

hope you like it, please rate me

disclaimer: this app is not privet and can take apart not only for zoom video chat. its not by zoom but it can be using for every video chat that can change the background while green screen behind.

instructions are inside, if its not clear please email me.