I’v just found 10000 motion caputre files which can be used in Blender http://www.e-motek.com/members/stockmoves/. After free registration you can download .c files.
I don’t know python but maybe somone can write simple script which read .c file with array of joints coordinates for every frame. Script should have two inputs: filename with coordinates and frame number to apply. I think for someone who knows python quite well it’s few minutes of work.
Had a look at the e-motek website. It looks like a great resource. As well as the mocap files there is also a converter available from the members area (version 1.04) that can convert from the .umf files to .bvh for use with Sysadm’s bvh.py script.
Also Lifeforms (http://www.lifeforms.com/products/index.html) is a useful tool for previewing and converting mocap data. I used the time limited demo to check the ballerina2 data was valid.
The GUI version uses the GUI module that, after a little digging, seemed to be a 2.10 (only?) feature? But with the non-gui script 2.25 seems to just crash.