My videoette wasn't really about making a horse stand while mounting. It's about moving a horse up to the mounting block and doing it without yourself having to move the block, get on and off it, or otherwise fiddle around there. It might not help if you horse is really bad about standing while mounting. That might be an issue that required you to be able to move him around until he offers to stand, and so you'd have to step off the block and work with him.
The video is really poor quality and hard to hear. It's a neat trick, and I am tickled that you want to see it (Mac, the horse steals the show) but it isnt' meant to teach a hrose how to stand quietly. Still, it might work if the horse is not really bad about it and you have the patience to work with it for as long as it takes.
Here it is: Help with mounting from mounting block