I was able to use camera on iOS 16 - before updating to iOS 16.0.2. When I first set up the phone on iOS 16, in third party apps it would switch between the normal and the other camera, depending on the distance to the object that you wanted to take a picture of - just like it does in the literal camera app. After updating to iOS 16.0.2, nothing works. Now here is what I'm 99% convinced is going on:
People on Twitter have reported the camera shaking issues on the iPhone 14 Pro. The stabilizer and autofocus would just freak out whenever you have opened a third party app's camera screen. Apple, instead of resolving the issue, have simply disabled the "switch cameras to focus close objects" feature for all third-party apps. Now we can't take close pictures or scan product barcodes. It would've been better to just throttle the camera-switching to something like "once in 5 seconds" that would avoid the shaky-behavior but still let us use cameras up close normally.
The fact that they haven't publicly admitted to the problem, or that there is no announcement regarding iOS 16.0.3 solving camera issues makes me fear that we will have to stick with this for a long time because they probably have other priorities than that. If they are even aware of the issue at all (?)
It's not the app publisher's fault, it's Apple's fault because before updating to 16.0.2 it worked fine in every app.