“Renfield” is a ridiculous, campy and excessively gory new adaptation of the story of Dracula — it is fantastic, provided that those adjectives appeal to you. The film pays its dues to the Draculas that came before it, even making direct cinematic references to the 1931 “Dracula” starring Bela Lugosi. The backstory comes in a “flashback” montage that recreates moments from that film, including the iconic lighting that illuminates just his eyes. Set in present-day New Orleans, Robert Montague Renfield (Nicholas Hoult), Dracula’s familiar, finds himself hoping to escape Dracula’s control. He has been serving Dracula (Nicolas Cage) for 90 years, bringing him victims and defending him from his enemies. In exchange, he receives agelessness and a fraction of Dracula’s powers, which he activates by eating insects.