How can I take a video snap shot during skype video call from my MacBook Pro?

Of just the window or full screen - SnapZPro X

Supposedly in OS X there is a built in full screen record, but it might not work with Skype or some programs like DVD Player, but SnapZ Pro X will.

Open QuickTime Player. Click the 'File' button, located on the menu bar at the top of the screen. Then select 'new screen recording'

If you want a 'screen shot' open Preview. Click the 'file' button located on the menu bar at the top of the screen. Select the kind of screen shot you want to take.

In order to find these 'applications' click on the finder icon located on the dock at the bottom of your screen. The finder icon looks like a square smilling face. When the finder window opens click on the applications button located to the left of the window.

OS X Lion: Shortcuts for taking pictures of the screen