We are a large private community inland from Marbella. Our board met to discuss this and whereas more security cameras were wanted on the Urbanisation they were out voted, so for now only strategic areas have been covered e.g. entrances and rubbish collection areas.
There are differences between Private and Town Hall run Urbanisations, but even if an Administrator gives you information that you cannot put up cameras always advisable to get a second qualified opinion.
We have the same problem with dog mess, again the board wanted to put up more notices but were outvoted again, this was then left to the actual community to do something rather than the main Community.
I do know of a community near Marbella that fines owners for not clearing up mess.People can be fined in Malaga and some other towns for this as well. If you have a lot of dog owners this is a hard thing to control.