PresentationTube is a non-profit that has provided a complimentary service to teachers for several years. That service is the ability to tape-record video discussions based on PowerPoint pdfs and files. 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 talking over your PowerPoint slides or a PDF. You can tape-record with your webcam switched on or you can choose to just tape your voice discussing your slides or PDF. While youre tape-recording you can draw on the screen, add text notes to the screen, and highlight text on the screen..
When you have ended up taping a presentation with PresentationTubes Chrome extension you can publish it directly to the PresentationTube website where you can then release 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 anybody who is searching for a new, easier method to develop video lessons based upon their existing slides. Sadly, it only deals with PowerPoint or PDFs at this time. Ideally, in the future there will be support for Google Slides. In the meantime you can always download your Google Slides as PPT or PDF to utilize with PresentationTube.