Crochet on the Double, also sometimes known as Cro-Knit, uses a long double-ended crochet hook (sometimes called a cro-hook). It's one of the many variances of Tunisian crochet, and well worth learning.
I have done the tube in several different ways, even with beads, but I have never did it this way. It is foreign, but you can understand it by looking at the video. This can be used in so many different ways with different sizes yarn and hook.