either aff first person template to project and set game mode to first person or if you want to keep all controls and character from city sample just add another camera to character , position it to be first person position and rotation and disable Auto start on original camera, you might also set blend mode to start on new camera or just add some control key to switch between 1st and 3rd person
target on blend is your character or controlled pawn and camera is your new camera
i have this in my player controller as it was better for my case but you can set it up in your character or whereever you wish