Download U Chroma Key Free Unity. 

UChromaKey is a real-time GPU chroma key solution for Unity.

Demos:
Windows
Mac OS
Android APK
Webplayer

Flexible color keying algorythm allows very precise setup while integrated camera support takes care of video sources. Supports any texture as a source, including RenderTexture and MovieTexture.

Features:
– Fullscreen effect
– Ability to apply ChromaKey to materials (unlit and lit versions of ChromaKey shaders included)
– Ability to apply ChromaKey to alpha-channel of any texture at runtime
– Camera sources handling
– Tested on iOS and Android
– Tested with Vuforia

Manual