The video shows a person playing a first-person shooter game on a smartphone. The player is holding the phone with both hands and using their thumbs to control the game. The game appears to be set in a corridor with walls on either side. The player is moving through the corridor, aiming and shooting at enemies that appear in front of them. The game interface includes a map, health bar, ammo count, and other game-related information. The player successfully eliminates several enemies, as indicated by the on-screen notifications.