PresentationTube is a non-profit that has provided a complimentary service to instructors for several years. That service is the capability to tape-record video discussions based upon PowerPoint pdfs and files. Just recently, PresentationTube launched a Chrome extension that lets you develop video lessons in your web browser..

PresentationTubes Chrome extension will let you tape-record while discussing your PowerPoint slides or a PDF. You can tape with your web cam turned on or you can choose to simply tape your voice talking over your slides or PDF. While youre tape-recording you can draw on the screen, include text notes to the screen, and emphasize text on the screen..
When you have actually ended up tape-recording a presentation with PresentationTubes Chrome extension you can publish it straight to the PresentationTube site where you can then publish it publicly or keep it unlisted. Just Like Google Docs, if you make your PresentationTube unlisted then only individuals who have the direct link to it can view it..
Applications for Education.
PresentationTubes Chrome extension might be a good one for anyone who is looking for a new, simpler method to develop 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.