How can I get a copy of street surveillance tapes?

Can you answer patty c’s question about Surveillance?:

If there was a disturbance on the street, how can I get access to the surveillance tapes that show the action at the time? Do I need a lawyer for this and how long before the tapes are deleted?

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What does it look like when a lawyer tries to get a surveillance tape?

Can you answer Miguel L’s question about Surveillance?:

This is for a medium length story I’m writing. In one part the character’s lawyer manages to get the surveillance footage needed, but I don’t know how to write about it. Does the lawyer do it by supbeana? What does that look like in NY?

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