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Vaguely, but it sounds like it was a fairly 'manual' sort of tracking: they attached GPS devices to the vehicles, so watching them on CCTV just meant switching to feeds based on the GPS location, rather than some kind of automated vehicle-following algorithm.

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The UK has a scarily-advanced automatic number plate recognition system in place throughout many parts of the UK, particularly London and the south east. The police can, and do, track vehicles in real time using this system. This is particularly true in London, where this is used to enforce the congestion charge.

Although the collection of the congestion charge is automated, this system can be used to alert police to the location of a vehicle in real time.

http://en.wikipedia.org/wiki/Police-enforced_ANPR_in_the_UK

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