Let's talk about the second person point of view, but first, let's talk about video games. Suppose you've played any video game in the past twenty years. In that case, you'll know there are two camera positions developers can use.
Either you are above and just slightly behind the character. From this point of view, you can control the character, where they go, what they do, but the character is not you. The protagonist is Agent 47, or Lara Croft. These games are called 3rd person shooters.
The other option for game devs is to put the player behind the eyes of the character. You see the world as they see it. Think back to games like Halo, or Call of Duty. You're not controlling the hero; you are the hero. These games are called 1st person shooters.