The video is how to use a wall jack. They didn't show how they put in the door frames either, dang it! For what it's worth, nailing the framing to the concrete pad is a completely different issue.....and another video somewhere on YT. Thanks for showing how to use wall jacks. As an older DIY'er soon to be building often by myself sometimes in rural areas, I need safe and efficient ways to complete tasks on my own so this was nice to watch as I wasn't familiar with the actual tool usage or procedure. My search on how to use wall jacks brought me right to your video.
