Hey...
You are attempting to use "Motion Body Capture Data" (MOCAP)...
BVH files are used through 3dsMax (Mostly)...
-You can create a model in Med then export it as an .fbx file...
-Import that file into 3dsMax (Lots of variables)...
-Attach the MOCAP data files (Using the "Motion Mixer")...
-Export as .fbx
-Import that file back into Med and "Re-Texture"...
That is explained very simply.
It's much more complicated than that...
There are tons of variables to be understood along the way...
Get yourself a copy of 3dsMax and start teaching yourself...