WHAT is MoCap?
Term MoCap or motion capture on present we are should use for describing an advanced motion tracking systems, that used for recording, couching and proceed analog signal data's gated from a real object (in 3d dimension) into a digital view of creating an animation sequence. All proceeded digital data will convert into one of the most used formats (FBX, BVH) for applying all captured movements of a digital character or a motion system (military, sports, medicine or robotics).
The first film that created by using motion capture technology was a "Final Fantasy: the spirits within." And there are most-impressive projects from first 2001 (Final Fantasy: The Spirits Within) to the present day (Rise of the Planet of the Apes). For now MoCap used in most height budget and most rated films, it's not for one it's not a secret.