Track whether students are watching your videos, pause the video and add in some "Check for Understanding" questions. Choose from a video library, Youtube or insert your own. You can also add in clarifying notes, your own voice, or images at any point in the video. The student cannot advance through or fast forward the video until they complete the questions.
Teachers create an account at edpuzzle.com and can link the videos and assign them directly to Google Classroom classes.
Click on the SLIDES to the right for screenshots of the process.
NOTE: Nearpod also has this feature where you can insert questions at various points in the video. Some Secondary educators have indicated that EdPuzzle has more Secondary content to choose from.