Hi
Usually there is a small bubble like object In the middle of the camera but this one clearly isn’t meant to be there
It could be debris behind the camera lens that can be removed by disassembling the device down to the camera and cleaning it with isopropyl alcohol and a cotton bud
Here’s the guide for that
[guide|146603|new_window=true]
You could also take it to the Apple Store and see what they can do for you if it’s under warranty
Hopefully this helps
Any questions please ask
Thanks:-)