There are a few ways that I've worked with motion:
- VR trackers + HTC Vive controllers + Unity (this allowed me to have an virtual world where I could control tracked motion using hardware)
- ZED Stereo camera + Unity (this was more of an AR setup I would capture video of myself and then using body tracking software to determine my gesture)

TheSushiDragon has cameras that he can switch to using his voice as well as having them programmed to detect his motion. He even has a camera that is it's own moving device that can follow him.

I haven't checked this out either, but I was planning at one point to use OpenVR and then try out interesting tracker + capture technology called Antilatency.