Image recognition to recognise body movements

I am looking for a freelancer to help me develop an image recognition system that can recognize full body movements. I need this system to be able to work with both video and still images. However, I do not need the system to be able to track multiple people in the same image. The freelancer selected should have the relevant skills and expertise in this field. The final product should be able to accurately recognize all of the body movements accurately.

There will also be a basic website development involved.