Good question asked zeebzob this question today. He said it can only be done by the host (John) and send it via email , but I don't know if Johns up for that. He does edit it and puts it on YouTube in a few days.
My thought is that you would have to use some sort of screen recording software which essentially records everything seen on the screen. What comes to mind is Camtasia, I'm sure there is other software out there that would do the same thing.