Video capture really should be part of the OS, like screencapture is. I use Screenflow on OS X to do this - it's very handy for demoing bugs to others, or sending people instructions etc.
Well done Windows.
Well done Windows.
QuicktimePlayer -> File menu -> New Screen Recording
https://www.google.com/imgres?imgurl=http://etc.usf.edu/tech...
For fullscreen audio and video recording, I would suggest simply running OBS. It might seem overkill, but it gets the job done.
I'd be curious if anyone has a JACK success story. It sounded like exactly what I was looking for, but in practice the thing was so arcane and impractical it seemed like too much trouble.