After the Apple Boot Camp drivers have been installed and your virtual machine has been rebooted, be sure to download and install any available updates from Apple's Boot Camp Support site.
After the updates have been installed, and your virtual machine has been rebooted again, connect the camera to your virtual machine:
Go to Virtual Machine > USB & Bluetooth (Fusion 4.x, 5.x and 6.x) / USB (Fusion 3.x and earlier) > Connect Apple Built-in iSight
Note: After installing the Boot Camp drivers and connecting the iSight, Windows may report that it does not recognize the new hardware. If it asks to look for and install drivers, click Cancel.
The Windows Device Manager may show two entries for the iSight, one under Other devices where it reports that the device is not recognized, and the other under Imaging devices where it is recognized. This is to be expected because of the way Windows treats the Apple drivers. The iSight does not appear in the list of connected drives and devices in (My) Computer, but software that requires a camera does recognize the iSight.