I just watched the video. That is a knitted cast on and it's a good one do do. When she takes the needle out and pulls the stitch tight...don't do that or at least don't do it tightly. It needs to be loose so you can get the needle in to knit the next row.
Now when you are knitting the row don't pull tight either. Remember it's okay if it feels a little loose.
BTW..we have videos here at the tab at the top of the page.