https://www.polygon.com/2018/9/20/17871742/red-dead-redemption-2-first-person-mode-camera-controls

Red Dead Redemption 2 includes a first-person mode that extends through the whole game, allowing players to get up close and personal with the twilight of the Wild West.

We played Red Dead Redemption 2 at publisher Rockstar Games’ headquarters in New York City earlier this month, and briefly tried out the first-person mode. It’s dead simple to enter: On the PlayStation 4, you can press the controller’s touchpad in order to cycle between three perspectives at any time: third-person, first-person and cinematic cameras.