The out-of-body experience is when a person experiences the world from a location outside of their physical body. With out-of-body experience, you feel as if you're outside of yourself and looking at your body from another perspective. I am not a video gamer myself however an example of this would be when they wear goggles that places them directly in the game. It's as if the person is in the TV playing the actual role. I personally wouldn't be able to do that without feeling really weird. It would take time to adjust if I did do this. It's incredible how our brain can change to accommodate the simplest experiences. I provided a TEDtalk below that explains the experience, our consciousness and the cognitive neuroprosthetics. The book also explains this in chapter 6.