How do I motion track a person and control an armature? I am working on an animation series with fight scenes. Animating everything by hand takes a lot of time and doesn’t always look good. I was wondering if I could motion track a person with various markers and transfer the movement to a rigged character. Then movements would be smooth and realistic. Can I do this only using Blender or do I need special equipment and software? ;)
Check out the camera tracking capability. The tutorials (e.g. from Blender Guru) use it to track camera motion, but you could try and attach your rig to the tracked objects. 

Haven't tried it myself.