Courtesy of video effects and technology, I superimpose our graduating Youth onto virtual backgrounds, or over animated digital backdrops.
As you will see in the Pre-Green Screen Effects photos - the secret of color keying or chromakeying --- is isolating the GREEN.
The technology of Final Cut Pro X makes that value transparent, allowing another image to show through the affected areas.
I have been using the special effect of color keying in post-production for about four years ago.