XVidCap is such a software which will capture your screen quite easily and smartly :) You may want to capture video of your desktop for documentation purpose or you may want to have a video of some activities in your desktop.
Just install XVidCap from Ubuntu Software Center and enjoy capturing your screen smartly!
Its size is 2,859kB on disk.
Applications -> Ubuntu Software Center -> Sound & Video -> XVidCapand then install it.
After installing you will find it in Applications -> Sound & Video -> XVidCap Screen Capture
You can save the video in MPEG or AVI files format.
I am giving a short video captured by XVidCap bellow-
Lets enjoy capturing your screen :D