How to visualize in chess? Skip to 2:08:27 in this video https://youtu.be/nK4SNEbMn7s.
What exactly is GMHikaru doing that?How can I be able to do that?Does it comes naturally with practice or their are exercises?
Okay, this sequence is very impressive and Nakamura is a "beast". So I don't want to be too pessimistic but I'm afraid that this kind of performance, which consists in calculating at the speed of light a sequence of movements without error, is only possible for the highest rated players. 

There is, however, a (little) hope. In the excellent perpetual chess podcast talk, GM Rustam Kasimdzhanov talks about Nakamura. He notices about his play and the play of some of the top teenagers in the chess world, including GMs Nodirbek Abdussatorov and Alireza Firouzja that they never blunder, even under stress, and their tactical perception of the position is extremely clear. The reason could be the thousands of games, especially blitz games, they have played. So go practice!