GLSL shaders for chroma keying

I need someone with expertise in GLSL programming to help me create custom shaders for chroma keying. The shaders will be used for custom software and will need to be optimized for 1080p resolution. The chroma keying will utilize the color green. I require someone with an advanced understanding of GLSL shaders and chroma keying who can ensure the best results. I'm looking for someone who is motivated and has a great eye for detail.

I have attached a image , the result needs to be better than the image.