how the hd graphics 2000 or 3000 works ?? is this video inside processor like grapich card?

Intel graphics controllers are discrete controllers embedded into a processor, this means that a chipset is integrated using processor capabilities.

If you need information about the second generation Intel HD Graphics, I recommend checking below:

http://software.intel.com/en-us/articles/quick-reference-guide-to-intel-integrated-graphics/

http://www.intel.com/p/en_US/support/highlights/graphics/cp2-hd3000

Thanks

Allan.

http://www.realworldtech.com/page.cfm?ArticleID=RWT080811195102&p=1  

This may be useful.