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The Game
In this video https://www.youtube.com/watch?v=t6ORxZtcbOI
The person went at the side of the map, but i don't understand is how he went there
can you please tell me?
Answer

But spectator mode can not be used to go at side of the map; Spectator mode is used to fit a camera at one place.

That's not true, I think you are talking about changing the camera settings from the console. Check the hyperlink in the answer to learn about original spectator mode.
Customer support service by UserEcho
The author of the video used spectator mode.