Dear Dr. Cabell,

I did a search on the internet and gathered some companies that sell systems with markerless technology:
http://analisedemarcha.com/links/links_01-mocap_c.php

Dary Motion system seems to use its own camera system, but the computational resources should be high as you mentioned. If possible, consult Mr. Mike Kocourek to clarify technical issues - he also has experience with high performance 3d optical mocap systems (Motion Analysis Co.). I did not find the technical specifications of the system or information about computational processing resource needs.

Maybe inertial systems (IMMU) is an alternative to your project.

Thank you for your attention.
Best Regards,