Go to: https://chrome.google.com/webstore/detail/screencastify-screen-vide/mmeijimgabbpbgpdklnllpncmdofkcpn/related?hl=en-US&authuser=1add ScreenCastify extension to your Google Chromebook.  Once it is added students are able to easily create a video with the screen and themselves using the camera to detail what they have learned on any particular subject or software usage.