There are a lot of different mocap solutions out there, from the not-so-expensive ones to the really expensive ones. I am not familiar with mocap in iClone, so I can't give you any details about it.

If you ask me, I'd totally recommend iPi Desktop Motion Capture, which I reviewed here. It offers very good results and doesn't require expensive hardware (you just need a few Playstation Eye cameras). You can get your own studio for a few hundreds using iPi DMP. More robust solutions from other vendors can cost thousands upon thousands of dollars.

nemirc
Renderosity Magazine Staff Writer
https://renderositymagazine.com/users/nemirc
https://about.me/aris3d/