First, I watched a video made by Carla Arena where first she uses her webcam video to introduce what she's going to show and then shares her desktop. I already had Jing installed in my laptop , however, not the Pro version which allows you to record your webcam video and also publish it easily in Youtube. http://www.techsmith.com/jing.html
|image originally from Shelly Terrell's blog|
This is the tutorial I made.