Benefits - No Ads - Green Screen with Gif image 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 color 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.