So I'm watching some clips from that new "Spike" series (http://www.spike.com/show/25183) "MoCap LLC" (based on some funny webisodes (http://www.youtube.com/profile?user=mocapllc&view=videos))
and a related video shows something cool -- using a buncha normal digital cameras at certain angles, some fancy schmancy software can do the mocap without needing "markers"...
http://www.newscientist.com/article/dn14007
It certainly brings to mind that scene in "The Running Man", where they "killed" the Arnold character... by killing a peon and pasting on the face (http://www.newscientist.com/article/mg19426006.800-perfect-clones-to-the-last-computergenerated-wrinkle.html?full=true) of Arnold onto the basically MoCap footage.