Wow, that's a great video regardless of the quality. Starting with the photographer staring face to face with the engine standing right on the tracks. These days he probably would have gotten arrested. An amazing consist with heritage single level sleeper, a heritage transition car, and a mix of Hi-levels and Superliners. Only thing missing was an SSL, presumably because the Desert Wind was part of a combined California Zephyr. Great sound capture as well.
According to the comments on the YouTube, it was shot on a Super-8 film camera with sound recording ability. That was pretty high tech for those days. Possibly something like this:
https://www.etsy.com/listing/1540241412/bolex-581-sound-macrozoom-super-8-cine
If you think that's weird, check out this photo of two Desert Winds meeting at Cajun Pass in 1981, courtesy of Wikipedia...
View attachment 38183