You do not need to remove the backplate to remove ANY CPU cooler. The fasteners should remove from the cooler side that attach to the backplate hardware, and you have to remove the CPU side hardware from the mounting hardware before you can remove the fasteners that attach the front hardware to the backplate anyhow.
I think you need to slow down, and start over, on the other side of the motherboard.
Also, if you're going to post videos, post them on Youtube and then link to them here. There are many of us that will absolutely not visit a link on twitter or similar sites.