If you went to HP download and support page and does not find the webcam driver listed, you can download and install the HP universal webcam driver (T/C apply). Base on my experience, Hp didn't list the webcam driver for model which the webcam driver automatically installed along windows installation. But in certain cases windows did not install the webcam drivers.
HP Universal Webcam Drivers
Version 1.00, Feb 8 2013, 16MB
Windows XP/Vista/7/8 : Download
Notes: Windows 8 and 8.1, if installation failed, set the compatibility to windows 7 first, then right click and select run as admin to install.