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I grew up in the desert around these snakes, they are old familiar friends. Once you know how they act and how to avoid them they aren't that scary. Though I have stepped over them a few times accidentally while hiking right as they let out their warning rattle that gave me a pump of adrenaline lol. They rattle loudly so as to warn you before biting so it is easy to avoid their bites. This is what they look like when they are warning you

Incredible, I just recently saw in the video you shared that he warns in such a manner, anyway I wouldn't dare go near him anyway. I salute you managed to record him and take good pictures.