Don't have a video link, but have used this method in the past. You don't have to cut the batting in a wavy line. If you have ever pieced batting before, just use that same method to join the next section. You can butt the 2 pieces together, whip stitch by hand, use a wide machine zig zag or use some of that fusible made for this purpose. Just think about which method you will use and leave enough unquilted so you can accomplish it. Also, make sure you keep the unsandwiched portion of the top & backing out of the way when you quilt!