Part one of a multi-part tutorial by Trey Morgan who covers the basic and advanced topics when tracking with Mocha for After Effects, some really helpful stuff here, even if you have used Mocha for After Effects to create a track before.

Advanced Motion Tracking Part 1 from Trey Morgan on Vimeo.

In this tutorial, I cover basic and some more advanced tracking features of Mocha for After Effects. I start with an easy screen replace to show the basics and then move on to a more challenging clip (obstructions, tracking plane moving off screen, etc.)