The following link refers to the ability to capture, a built-in feature of Virtual Box.
https://www.virtualbox.org/ticket/4766

And it's mentioned into the link that the feature as a result of the following packages:
http://www.virtualbox.org/svn/vbox/t.../VideoCapture/

So, How does it works? I couldn't find any featur into virtualbox menu to enable this ability!



Extra links:
https://www.virtualbox.org/wiki/Linux_Downloads
https://help.ubuntu.com/community/VirtualBox
http://askubuntu.com/questions/41478...-of-virtualbox