how can you play with this without any data?

"The training data used for the deep neural network was generated using Remedy Entertainment’s in-house capture pipeline based on a cutting edge commercial DI4D PRO system [Dimensional Imaging 2016] that employs nine video cameras."

There are lots of sources for mocap data if you know people in the film, games, or entertainment industry.

You can always take tested ideas and apply to your own rig. The pioneering work was done by NVidia already, you see the results and it's up to you how much inspiration can you take from their work.

Coursera and Udemy are not subscription based.

link seems broken to me, but here is something that i know: http://academictorrents.com/