Camtasia Studio Camtasia for Mac is a great shoot, just register for the Macintosh, and your desktop in full screen or a defined area of the captured image as a webcam for video editing have been developed.
Camtasia allows you to record video and even sound to determine the source of active webcam if necessary.
Once the video capture filter, and with many options you can edit with a specific tool.
When the video is finished. You can share it via YouTube or on iTunes.