"Your Mac's built-in screen recorder
Posted on Wednesday, January 8th, 2014 at 5:54 am. PT
Written by Dave Mark
Not sure when this feature got added, but since this was new to me, thought this was worth sharing.
Launch QuickTime Player (it's in your Applications folder). Now select New Screen Recording from the File menu, or type control-command-N. A small screen recording window will appear, like so:"