Tutorial about tracking, chromakey and replace green screen with 3D scene

I search a Tutorial where is showing how to key out the green screen, than how to track the footage and import the real person in a 3D virtual set. It is possible to import a already keyed footage into blender?
There is an example that I found in Youtube: http://www.youtube.com/watch?v=XLmuNz1TMXc
Is there any Tutorial that shows how to do that?