Eu diria que o material produzido é o mesmo que para o Ubuntu :
- Make sure the virtual machine is not running and your webcam is not being used.
- Bring up the main VBox window and in the details tab for your Win7 machine click USB.
- Make sure "Enable USB Controller" is selected. Also make sure that "Enable USB 2.0 (EHCI) Controller" is selected too.
- Click the "Add filter from device" button (the cable with the '+' icon).
- Select your device from the list.
- Now click OK and start your VM.