Enter eduCanon. eduCanon is a free, web-based platform that allows you to build formative assessments right on top on any YouTube video. The site has a lesson builder where you select a YouTube video and then you create your own multiple choice questions that go along with the video. You can embed questions at specific points. You decide exactly when a questions will pop up during the video.
You can also monitor students results. When you sign up as a teacher, you can create class lists, then assign lessons to those classes. The site then gives you a breakdown of each student's responses.
Here is how it works: