I am instinctively opposed to CCTV cameras. Just the thought of cameras pointed at me while a go about my everyday business sends shivers down my spine.
In response to the 'nothing to hide, nothing to fear' argument, i would say that we must have complete trust in the police, government or any other authority able to obtain CCTV footage before we can truly say that we have nothing to fear from being filmed and recorded. I don't have that level of faith in our democratic system. At a governmental level, decisions are taken and laws are passed that bear no resemblance to the will of the people who are used in a variety of of ways to further the ends of a powerful minority. I don't want that minority to have any more information about me than they have to. It only serves to concentrate their power.
I think that the presence of CCTV scares people. When we are confronted by authority we keep our heads down and act as 'normal' as possible. What does the presence of this authority on every street corner do for freedom of expression? In some authoratarian countries they have policeman with guns standing on street corners. People are scared to express their opinions outside of their own homes. Do we really want to move a step closer to that situation?