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First of all, no organization fixes CCTV cameras without their staffs being aware so that in a case where a staff is caught doing unpleasant stuffs in the office, it can be traceable. Talking about privacy, it is only guaranteed at your most convenient private places and not in an establishment where everyone is at liberty to access wherever to want to within the scope of that environment of work.
We can't dispute the numerous aid technology has brought to mankind such that one can easily do anything even at your most convenient places however, the use of technology needs not to be abused because there are people in the society who uses this technology as a way to undue others which is very bad .
These cctv cameras are placed in offices at strategic locations, where your privacy is not compromised. Worry if inside the toilet/washroom, there are also cameras. But within office premises where they believe are important to have one, they will surely install for the benefit of the company as well as employees. If you have nothing to hide and just doing your work, you don't need to complain about such cameras.
I fully agree with your statement here that indeed the existence of CCTV cameras installed in several parts of the office room is actually only for the benefit of the company itself to ensure that its employees are really doing their job well, nothing more than that. As for privacy issues, I think this is another thing that should not be involved with work issues, CCTV is only to ensure that employees do their jobs properly and in accordance with what they have been instructed and in accordance with the tasks they have agreed to before entering the company.
On the other hand, the office atmosphere is not a place for you or any employee to show your privacy and the company also does not want to see your privacy because it is not the right time to show something that you think is private, they install CCTV nothing more than to ensure the productivity of the workers, we do not need to object or feel disturbed by such surveillance if we feel we have not done anything wrong.