PresentationTube is a non-profit that has actually offered a totally free service to teachers for several years. That service is the ability to tape video presentations based upon PowerPoint files and PDFs. 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 web cam turned on or you can select to just tape-record your voice talking over your slides or PDF. While youre recording you can make use of the screen, add text notes to the screen, and emphasize text on the screen..
When you have actually finished tape-recording a discussion with PresentationTubes Chrome extension you can publish it directly to the PresentationTube website 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 see it..
Applications for Education.
PresentationTubes Chrome extension could be a great one for anyone who is looking for a new, simpler way to develop video lessons based on their existing slides. It only works with PowerPoint or PDFs at this time. Hopefully, in the future there will be support for Google Slides. In the meantime you can constantly download your Google Slides as PPT or PDF to utilize with PresentationTube.