They encourage you to make appointments in advance in order to make sure that the footage you wish to see is available for you. You are required to watch it there at the library, and are given a short window of time to watch it. No, they do not give out copies. They have you under strict guidelines for the purpose of preventing duplicates being made of these recordings. All you really need is a reason for why you wish to see the footage (say, research) and an NPL card.
"Mostly, I loved the size of these people's emotions. Nobody has emotions this size anymore. Outsized emotions. Operatic emotions. Kushemski and Vanda are like Tristan and Isolde, they're Paolo and Francesca. Nobody's in total thrall like this anymore. Nobody's overcome by passion like this, or goes through this kind of rage." Thomas, Venus in Fur