Hi,
Do try to uninstall/reinstall the Webcam driver from Device Manager.
- Open/search Device Manager then right click on the webcam driver and select Uninstall.
- Download and install the webcam driver from HP support site.
- Here's the link where you can download the driver:
http://support.hp.com/us-en/drivers
- Use the model/ product number of your laptop so it would give you the exact drivers for it.
- Reboot your laptop then test it again.