PresentationTube is a non-profit that has actually provided a totally free service to teachers for lots of years. That service is the ability to tape-record video presentations based upon PowerPoint files and PDFs. Just recently, PresentationTube launched a Chrome extension that lets you produce video lessons in your web browser..

PresentationTubes Chrome extension will let you tape while discussing your PowerPoint slides or a PDF. You can tape-record with your cam turned on or you can select to simply record your voice discussing your slides or PDF. While youre recording you can make use of the screen, add text notes to the screen, and highlight text on the screen..
When you have completed taping a presentation with PresentationTubes Chrome extension you can submit it straight to the PresentationTube site where you can then release it publicly or keep it unlisted. Just Like Google Docs, if you make your PresentationTube unlisted then just people who have the direct link to it can view it..
Applications for Education.
PresentationTubes Chrome extension could be an excellent one for anybody who is looking for a new, simpler way to create video lessons based upon their existing slides. Regrettably, it only deals with PowerPoint or PDFs at this time. Ideally, in the future there will be assistance for Google Slides. In the meantime you can constantly download your Google Slides as PPT or PDF to use with PresentationTube.