This is a trailer of an excellent “mountain” documentary (and the crazy-people-who-climb-them-and-jump-off-of-them documentary), aptly named Mountain.
As far as I know, if is only available on YouTube. And to see it in “HD” high resolution, it is apparently necessary to watch it on a TV via Roku, AppleTV, etc. For some reason, YouTube seems to cap the resolution at 480p on computer browsers. But why watch such spectacular filming on a computer screen anyway, right?
Here is the actual documentary link: https://youtu.be/E0Y-iMNmpAA
I found it on Roku YouTube by searching the words “mountain” and “dafoe” (the search word “mountain” alone is too ubiquitous). Actor William Dafoe is the narrator.