Yes you can if you use a filter system such as Cokin. You can add hoods to the front but beware of vignetting since it is not the original hood for your lens.u cant turn the cpl if you attach the hood.
so..
no hood.
of course you may put the hood back on after you had adjusted the poloriser. but too much a trouble.
the light should be coming from an angle that is perpendicular to the direction you're aiming/shooting for maximum polarization. But it doesn't mean the light must be shining INTO the camera from the sidesSorry to interrupt. For cpl to be effective, we need sunlight coming from left or right side. But with the hood blocking the sun ray, will the cpl still work? I do not have a cpl yet. thus trying to imagine how it looks. ;p