Scott, One thing you can do is set up your website or application to make students login to view their video. You can then check their logins and see when they were on the site. When I begin using this strategy next fall, it will not be a true flipped classroom. Many of our students do not have internet at home, so what I will be doing is having them come into the classroom, watch the video, and then begin their homework. This way, if a student understands it, they can get right to work. It will not be as efficient as having them watch it at home, but you have to work with what you have. Another option you can do is have a short quiz at the end of your presentation. This can be set to notify you when a student completes it. Then you will be able to know when students completed the video and the quiz. Let me know if this helps!