PresentationTube is a non-profit that has actually provided a free service to teachers for numerous years. That service is the capability to tape-record video discussions based upon PowerPoint pdfs and files. Recently, PresentationTube released a Chrome extension that lets you create video lessons in your web browser..

PresentationTubes Chrome extension will let you tape while talking over your PowerPoint slides or a PDF. You can tape with your webcam turned on or you can choose to simply tape your voice discussing 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 upload it straight to the PresentationTube site where you can then release it publicly or keep it unlisted. Much like Google Docs, if you make your PresentationTube unlisted then just individuals who have the direct link to it can view it..
Applications for Education.
PresentationTubes Chrome extension could be a great one for anybody who is looking for a new, simpler method to develop video lessons based on their existing slides. Unfortunately, it just deals with PowerPoint or PDFs at this time. Hopefully, 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 use with PresentationTube.