Yea, the most interesting part of moving making is what James Cameron did in Avatar .... green screen, motion capture, and multi cameras, and much more that I'm not familiar with.
I've been on numerous green screen sets/sound stages and it's amazing what they can accomplish.
Avatar was simply all green boxes the day I saw it and Clint Eastwood's recent WWII movie was shot on a sound stage roughly the size of an indoor tennis court.
Now I hear that a director can photograph an actor from all sides with an advanced multi-camera system in an hour or less and then manipulate those images in a computer for any scene with a multiple number of other actors.
OH, YEA! THANKS for that interesting video, Swede.
Shoot them once and send them home and let the computer experts do the rest.