I love this kind of stuff but mine didn't come out too well! I cut the paper bag down to size with scissors and folded it with the video playing. You can see how uneven it is but it is still useful as a little project notebook.
Next time I will cut with a straight edge & craft knife and then start and stop the video while folding. The folds have to be close to precise as you can get. Practice. Practice. Keep using paper bags before trying this with good quality paper.