I know little about hacking and computers apart from what I have seen in films, and read in the press, but as far as I am aware no UK will convict anyone of CCTV footage alone, there has to be other stronger tangible evidence before they will even charge you let alone put you on trial.
Same for DNA even if your DNA is found at a crime scene, you cannot be put on trial on just the presence of your DNA, they need much more evidence than that, if they trace you.
like all technology it has both good and bad uses. If the government and using companies keep ahead of the curve and update and replace when necessary then it should be OK.Similar go the debate on ID cards I believe if you have nothing to hide you gave nothing to fear. I know that won't sit well with some people but it's 21st century technology.
We can already be followed of a fashion in so many ways, Google, amazon, fb, twitter and many others.
I am yet to see Google or amazon called upon to provide information about a person's movements. That said, if they can call upon it then so can we, getting off fines from cloned cars etc, fraud at cashpoints great if you can prove where you were on a given time on a given day.
It needs proper well thought out legislation.