Looking at the footage again, unless it has been cropped, the field of vision does not seem to be that wide. But if you look online at dash cams, most seem to be advertising 170 degree coverage. So one of them facing front and another facing back has almost the full 360.
As for warning signs, not something i have seen (not that i have been looking!), and i certainly didn't get any when i bought my dash cam.
But i can only assume the dash cam used in the Aston's case was quite subtle (maybe one of the type built in or clipped over the rear view mirror) otherwise surely it would have been seen by the d**kh**d and he wouldn't have been stupid enough to do what he did?.
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