What is it?
"Through the magic of video effects and technology, you can superimpose your subjects onto virtual backgrounds, place them over animated digital backdrops or transport them to a desert oasis. You can shrink down a full-grown man so he can stand on a tabletop, use visual effects to make him fly through the sky like a superhero or simply simulate your own TV weather report. But to do it right, you’re going to need... a green screen. The secret to pulling your subject out of the real world and placing him or her into a digital domain is chromakey, and that means going green" (https://www.videomaker.com/article/c10/17026-how-does-green-screen-work).
How do you use it?
Record your video in front of the green screen using the lighting and iPad tripod that are available in the green screen room, and then use a computer program or an app to remove the green background and replace it with a virtual background.
Green Screen Apps
Free (Good) - Veescope Live
Free (Good) - Green Screen Mobile Effects
Free (Better) - Hands-On Green Screen Effects
$1.99 (Better) - Green Screen Animation Studio
$2.99 (Best) - Green Screen by Do Ink