The bracket is held in place by a sticky material, probably some kind of double sided tape. You can jimmy it free, preserving the bracket, using a guitar pick and gentle pressure. The circular part of the bracket, which surrounds the camera hole has no adhesive, so you can easily slip the pick under there, and then move towards the sides where the adhesive is. Heating the bracket first (mildly, don't even get close to the temperature to melt the bracket) using a hairdresser / heatgun may allow you to preserve the original adhesive.