This is a tutorial about how to replace the screen in a cell-phone using Nuke. It deals with the challenges of tracking a glossy screen, and getting a good key from a light-emitting screen covered in smudges. I tried to speed through as many of the slow parts as possible, but it is still a bit lengthy. The tutorial is split into two 45 minute parts.
Part 1 covers the tracking challenges.
Part 2 covers keying and compositing the screen into the phone.
There is a key overlay which shows what keys are pressed so that you can reverse-engineer keyboard shortcuts if you do not know them.
Assets can be downloaded here, though I encourage you to shoot your own footage!