PresentationTube is a non-profit that has actually supplied a complimentary service to teachers for lots of years. That service is the capability to record video presentations based on PowerPoint pdfs and files. Just recently, PresentationTube launched a Chrome extension that lets you create video lessons in your web browser..

PresentationTubes Chrome extension will let you tape-record while discussing your PowerPoint slides or a PDF. You can record with your webcam switched on or you can pick to simply record your voice discussing your slides or PDF. While youre taping you can make use of the screen, add text notes to the screen, and highlight text on the screen..
When you have finished recording a discussion with PresentationTubes Chrome extension you can submit it directly to the PresentationTube website where you can then release it publicly or keep it unlisted. Similar To Google Docs, if you make your PresentationTube unlisted then just people who have the direct link to it can see it..
Applications for Education.
PresentationTubes Chrome extension could be a great one for anybody who is looking for a new, much easier way to produce video lessons based on their existing slides. In the meantime you can constantly download your Google Slides as PPT or PDF to use with PresentationTube.