I'm inclined to follow a more literary definition:
"Gothic fiction (sometimes referred to as Gothic horror) is a genre of literature that combines elements of both horror and romance. As a genre, it is generally believed to have been invented by the English author Horace Walpole, with his 1764 novel The Castle of Otranto."
This would mean the request would be defined as films that reproduce the themes and visuals commonly associated with the works of writers such as Bram Stoker (Dracula), Edgar Allen Poe (The Pit and the Pendulum), and Mary Shelley (Frankenstein). This would probably also include literary greats who's work was directly influenced by Gothic literature, such as Charles Dickens and Robert Louis Stevenson, as well as Emily and Charlotte Brontė.