http://www.cgcircuit.com/course/mastering-nuke-vol.-5

In this online course, you are going to learn some of the most important techniques to paint out, roto and track in Nuke. This is the bread and butter of compositors. This course will teach you those techniques that will give you the feeling that there are no limitation to image manipulation.
Rotoing, tracking, painting could seem a bit fastidious, but with the rights tools and the right workflow, you’ll see that it is actually not that hard, and even pretty enjoyable!