I don't honestly know the answer to your question about where the CCTV cameras are that make up that figure. I posted it mainly to try to demonstrate why, in the UK at least, people would probably feel uneasy about having even more cameras monitoring them, and so it would perhaps not be a terribly favourable way of improving safety and security at cash machines.
As for the cameras vs policemen, I think that people would feel more inclined to be watched over by a copper - a real live human being in a position of trust, rather than a machine (or system of machines) that could be recording every single move you make. People (even the beloved beat bobby) do not take in and retain all the information, whereas cameras and whatever they're linked to could.
The camera itself cannot distinguish between the actions of an innocent passer by and a violent robber. A policeman (or any other human) probably can, at least to a certain extent, and I imagine would focus their attention on the more suspicious characters and ignore the average person. In other words, humans are more discriminating in the information they process and retain, and so are likely to be seen as less threatening than an indiscriminate machine.
Many people (apart from those strange creatures who participate in reality TV programmes like Big Brother) do not feel comfortable with the notion of being permanently monitored by machines, for whatever reason.
Added to which, I suspect that having PC Plod observing the cash machine would deter a mugger far more than a few cameras would!
