A video filmed by a third party is not self-incrimination. It would be incrimination of the defendant by the third party's video evidence. Trials are preceded

A video filmed by a third party is not self-incrimination. It would be incrimination of the defendant by the third party's video evidence. Trials are preceded by a long process of discovery and, in general both sides will have access to all evidence that is going to be used in the trial. Edit: incorrect punctuation marks snuck in.