Circular knitters are incredibly complex machines. I've not watched the video yet (blocked at work), but unless it is running at a very slow pace, they are occasionally subject to interruptions including yarn, needle and/or sinker breaks.
Even so, that pair of socks you're wearing may have been knit on a machine first put in service before 1900. Typical needle counts for hosiery include 60, 84, 132, and 176; stockings may be knit on a machine with over 300 needles.