Modder HanaShirokuma has released a modification for the original Red Dead Redemption that adds a first person mode to the game. The creator notes that some visual bugs may occur, especially while riding a horse.
You can download the mod here. The page also includes a detailed installation guide. As a reminder, Red Dead Redemption was released on PC in October of this year. The project has received 93% positive reviews on Steam. By the way, we recently published a collection of 20 awesome fan videos and mods inspired by the RDR series.