Screencasting Tip: Resize Your App To 720p (1280×720) In OSX
"By using this little script, I can set all of the windows of the apps that I want to record to the correct size. Then when I record the screencast, I can crop the viewable area down to 1280×720 and all of my apps will take up the full screen, providing pixel-perfect clarity on any device that can display 720p (like an iPad for example)."
Except that every window on OS X has rounded corner and whatever is underneath will look through the cropped video. Why not just set the monitor to 720p if it’s the desired screencast resolution?