Yes you can. Just add the Virtual machine and select the boot camp partition. After a one off prep process of several minutes, you can boot into your Windows bootcamp partition.

Performance wise, it wont be the same. Aero will not be supported in most cases. I had problems with my Adobe software as they detected it as a 'separate' installation so I had to give them a call to get it reactivated. You can play some games that does not require high end graphics but generally usable for productivity applications