camera patrols instead of police patrols

Note a couple of subtleties here:

Do remember, too, that it is '...DES caméras' — "going the rounds of the cameras" — not just any old cameras in general.

We wouldn't normally use the term 'ronde' to convey the notion of a 'system' or 'circuit' or 'network' of (e.g.)surveillance cameras

Nor would we frequently use 'ronde' to describe the 'arc' made by a camera as it scans across a scene.

So I don't think these sit well at either a macro or micro level.

Do note, however, that it could mean a physical round — checking that the cameras are present and working; however, that it much easier to do from the comfort of your chair at the other end of a long cable. Aside from hazardous environments not suitable for visiting by humans, generally cameras are of greatest use when monitored remotely.

So my hunch would be more along the lines of "regularly looking round all the camera screens in the control room" apart from just idly scanning across them to see if there's any suspect activity, in large set ups it may also be necessary to use to some kind of switching system to swicth images between them, as might be the case with very many cameras and not enough screens to meaningfully survey.



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Note added at 4 hrs (2021-05-31 14:34:12 GMT)
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So I should have come back to where I started, to say maybe we need to look at is 'rounds of the cameras'.