My guess is that the hp-cam does not work with Device Stage. If it does, when you connect it your computer the Device Stage should open. The manufacturer (in this case, HP) must add compatible software (also called firmware) to the device in order for it to work with the Device Stage. HP should be able to confirm an answer for you.
Here is a bit more on Device Stage - Hardware home pages: Master your devices with Device Stage
Microsoft Windows Outreach