Inserting a video inside a green screen window

Greetings Everyone.

I'm experimenting with a SciFi style project kind of like Dr. Who and would like to take display a video in place of a window that happens to be coloured green. Do you know of a tutorial that teaches the details on how to accomplish that?

In the attached screen shot is the 3 panelled green window I would like to have the video displayed.

A brief overview:

different-ways-to-use-chroma-key-to-create-interesting-visual-effects-v

Thank you so much. That tutorial was so helpful. 😃

Here's what I made with the help from the tutorial:

Gorilla Visiting Mars