For me, I have always loved jackets with these zippers -- much for comfortable when sitting in a long jacket or using the bathroom in a gas station, etc.
I have found the secret to opening the jacket is to make sure the lower pull is ALL THE WAY DOWN. Then, just bring the upper pull down like you would do to unzip any jacket and it should be open. When zipping up, make sure the two pulls are tightly together in your fingers when you slip the pulls on to the bottom of the other side of the zipper.
I assume this is what the video shows but I have not watched it.
Good luck!