This should be a fairly open and shut piracy case for the video maker. Zoo is a British magazine with a real company behind it. Facebook is a US-based company and is redistributing the video (and likely making money from the adverts). The video maker is based in the US. He can start with filing a case against FB (seems he has a US lawyer lined up already), and once he collects from that, he pays a UK lawyer to follow up against Zoo's parent.