I imagined at first that you had an external iSight camera..... but I don't know if any Intel's didn't have a camera....
Any-who, if Fusion didn't do it automatically, make sure the VMWare Tools have been installed. Check the menus for that option while VMWare is running for that option (it might only say "uninstall" if they are currently installed).
After that, I would imagine it acts as a USB device (only one OS can use it at a time,), which involves going into the devices section (again, check the menus, I'm not at my machine to look), and make sure you have checked/selected the iSight camera.
Windows should then start beeping and booping and displaying some informative bubbles to signify that a device has been plugged in, just in case some evil gnomes were sneaking around behind your machine and plugging things in without your knowledge.