I've always wondered about this, and I was going to ask just my fellow Adobe Community Professionals, but I thought it was the perfect question for the larger community to help.
I've seen many people--Eric Reno, the TipSquirrel the most recent--do his own green screen video work by painting a wall or two, or setting up a backdrop, and then fill in video backgrounds. I've always wondered how I could do it, how it worked. I know how the concept works--replace a particular shade of green (and before it, blue) in a video editor. But how can it be done in video conferencing like Skype or FaceTime? Can it be done live like that?
How could a green screen be replaced in a screencasting/video program like ScreenFlow or Camtasia for those occasional standup intros?
I found this interesting demo on YouTube using a computer algorithm to digitally substitute backgrounds without Chroma Key.
You might try VeeScope Live.
Thanks for the mention! I've been experimenting at home for some time. I'm lucky in that I teach in a centre where green screen is used widely so it was a matter of scale than anything else.
I found Camtasia works well with keying but I was already planning on using Premier to edit, so I key there. This also allows for an irregular garbage matt.
Live keying for use in Skype or the like isn't available in Camtasia or Premiere, you'd need to run through dedicated keying software.
Gimme a shout if I can help in any way Pariah