...and a different way to me too....now how to explain this without photos...just looking up my terminology...
I form a bight in the rope, pass it across the standing part and loop it under to form the top bend and top loop all in one action so it looks like half a sheep shank.
That gets me to the same stage as part of your video, with a "top loop" and a "bottom loop" surrounded by a half hitch (?).
Now, the important bit that wasn't shown was a half twist in the "bottom loop", this stops the half hitch from slipping out when the knot is tensioned.
When roping a trailer, the working part is formed into loop (I'll call this the "lower loop") and passed through the bottom loop and then the lower loop slips over a rope hook and the working part is pulled to tighten it all up. The working part is then secure to the same hook with a half hitch and reversed half hitch before moving on to the next hooks. That's what I was shown, many years ago, anyway. If you haven't got a hook and you have to go around an object such as a tree, you have to pass the rope through as you've shown.
Only thing to add is that you can then create more of these in the working part to make a pulley system for generating more tension.
There's also a different knot with the same name, formed by twisting the rope several times and passing the working loop through the loop formed.
I've yet to try a
versatackle but it looks interesting.