Hi,
May I ask if your cam is built-in or an external device? If you are using an external device, please check whether your camera works on another device.
Also, verify if your device functions properly with other external cameras. It is possible that your current external camera is not compatible with the latest update.
In the meantime, try shutting down your PC.
Press the SHIFT key + Shutdown or press the power button for 10 seconds until the PC turns off. Unplug external devices from the PC for 30 seconds, except the mouse and keyboard, then turn your PC on. Then plug the camera device (if not built-in), and turn on your camera. See if it is working.
Please let me know how it goes. I look forward to your response.
Stay Safe!