Mocap is way expensive and probably not a good idea to buy for yourself. Maybe you could use a program called Poser. You can import your rigged Maya characters into and animate them. It has a really good run animation setup.
You could make a cheap mocap suit pretty easily with some aluminum foil and some fabric...
"The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man."
George Bernard Shaw - Man and Superman