Read an interview with one of the short film's creators, Landon Sperry.
This astonishingly well-made fan film for Skyrim could very well be a trailer for an HBO adaptation of the game.
"Dovahkiin, the noble dragonborn hero, is cursed in a fight with a vampire. He spends a considerable time wandering the realm before being captured by the Dark Brotherhood, who offer him a deal. Dovahkiin agrees to help the Brotherhood save a captured member from the Necromancers, in exchange for a cure to his vampirism."