I really like this Application called EdPuzzle. It allows for you to take a video and create Questions though out the video to keep the students engaged. They have the option to create Multiple- Choice, Short-Answer, Comments, Voice Over, and Audio Notes.
I could see using this is my biology classroom for Homework. Having students watch videos online at home and answer these interactive questions I have and submit there work online. This would allow me to keep accountability for the students to make sure they watch the entire video.