Snickers ads of "Don't Stop" take to the top position recently. Site at http://www.valkieser.com/web/howwedidit_1.html show how they do it.
Quote
"Because the life-action shoot would be shot with available light during magic hour and beyond, we started some 35mm tests to check if we still had enough focal depth and if our tracking software could still handle the low detail to extract an accurate camera track.
After the trafficlight man was final we headed over to the motion capture studio, and spend two days recording the action with a team of 6 stunt coordinators, which gave us over 200 individual takes. Four of our animators started building over 3 minutes of animatics for the offline edit, and 4 of our compositors started cleaning up the backplates and removing all the motion trackers."
more in http://www.valkieser.com/web/howwedidit_1.html