You have not taken the permission of the society to install cctv camera.
The terrace is the common area coming under the control of the society hence it is pertinent that you should obtain permission before installing the same.
Since this has earned the wrath of the society and also triggered ego issues, the society may not grant permission for this at this stage.
What was the necessity or purpose to install the CC TV camera, if your reasons are justified and convincing then you may put forth all the valid points in your letter seeking permission.
If the society is not allowing you even after your request you have nothing to agitate about it than to remove the same.