I have had the problem, only once in my time. At this stage, I would agree that it is more likely a hardware problem, only coincidental with the update.
But, have a quick look in settings -Apps and features -
Scroll down to the camera and click in.
Click Advanced options and make sure the camera is on. Updates/upgrades do have a bad habit of turning features off.
Scroll a little further down, on the same page, and try a reset.