Edpuzzle allows you to search for videos that are already on the net. You can duplicate the video and save it. You can then crop the video, add a voice-over, audio notes and even questions/quizzes. Edpuzzle gives flexibility to the teacher and means they dont have to create a whole new video from scratch!
The link to Edpuzzle: http://www.edpuzzle.com
I would be more driven in using ‘video’ within my teaching when teaching a new topic, as it would be a good way to let students visually see the information and process this in their own time. Students could visually process information with this tool and later come together and collaborate as a class to better understand the topic.