Chroma key description

Change your camera video background in real-time(video background changer).
Chroma key compositing, or chroma keying, is a visual-effects and post-production technique for compositing (layering) two images or video streams together based on colour hues (chroma range). The technique has been used in many fields to remove a background from the subject of a photo or video.
You can record yourself with changing the background behind you.