Excuse my curiosity, what is the school You study?
Have you asked your teachers about usefullness of those studies? So you want to become a human-mocap thing? 
If I were You, I would stick to toon animation, because:
a) real world motion knowledge is part of toon-anim;
b) when working for money its more likely you will be asked to do toon-anim;
c) enterprises doing lot of realistic animation have mocaps;
d) for low-budget project you can buy readymade mocap clips, or just decrease toonishness of handmade animation;
etc..
Realistic movement asks for realistic environment and it costs significant amount of money, so there should be money to have mocap or buy clips, otherwise its a charity project.
However, if You spitefully want to study just realworld motion, then have some clear full-body human action movie clips, 2D/3D-track bodyparts, count frames, learn motion paths and animation curves (speeds), look for syncing and secondary motions etc etc etc..
