Looks like some gopro type actioncam with stabilization would work nicely. I made videos of hikes when I was on Azores a few years ago with an old GoPro 5 and they look pretty good, so newer hardware should make it even better.

If you like the videos of Nippon Wandering, he states which equipment he uses for each video. In his last one he used DJI Osmo Pocket.

The new Insta360 GO 2 would probably work really well for these type of videos:

https://www.insta360.com/product/insta360-go2

Osmo Pocket is a good starter