For more detail this asset from the Unity Asset Store: Click Here
This is a paid asset, but now you can download U Chroma Key for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
U Chroma Key v1.4 (Latest version)
“If possible, please buy the package to support the developer”
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
Unity forums support thread
Also, you can send your questions, suggestions and bugreports to support email in publisher profile.
Latest version (1.4) requires Unity 5.6 or newer. Previous versions (1.3 &1.2c) is available for older versions of Unity.