I found myself needing to adjust the camera brightness programatically, and based on the current implementation for IAMCameraControl, I added methods for IAMVideoProcAmp, which seem to work pretty well. I've attached the files with the changes bellow.

The names I gave the methods within VideoCaptureDevice are: SetVideoProperty, GetVideoProperty and GetVideoPropertyRange, since SetCameraProperty etc were taken by the IAMCameraControl variants.