By accessing what are you referring to?
To shed some ignorant light (not knowing what exactly you mean) you will not be able to install video card specific drivers in a virtual machine. The drivers you'll be using are Fusions SVGA drivers and it'll render your video card as a generic (or similar) vga card. That's just how it works.
Using the above text, of course that would be the exact opposite in bootcamp since bootcamp is technically 'native' as if that IS your machine. VM's are emulated regardless of how real they may appear. They will access some items unemulated, like RAM, since your allocating ram to the virtual machine.