I'm trying to do lesson vids, and would like to record myself playing guitar along with notes moving. I'm thinking that the idea would be to run a screen capture of Bands In A Box playing the backing track, and then do a video overlay of me playing along with the running BIAB track. It's this possible? Or, let's say I record myself playing the chords to a tune; can I then record a video overlay in real time as I play along with the pre-recorded track?