Record currently active monitor (or allow changing the monitor to be recorded while recording)

[hotice]

Would it be possible to have an option to record the currently active monitor (so it would switch between monitors/screens and record the one that has the mouse cursor or active window) or allow changing the recorded screen while recording?

That would be very useful when trying to show multi-monitor features in the screencast.

[MaartenBaert]

Good idea, and pretty easy to implement. I've added it to the todo list.