PresentationTube is a non-profit that has supplied a free service to teachers for several years. That service is the capability to tape-record video presentations based on PowerPoint files and PDFs. Recently, PresentationTube launched a Chrome extension that lets you develop video lessons in your web internet browser..

PresentationTubes Chrome extension will let you tape while discussing your PowerPoint slides or a PDF. You can record with your webcam switched on or you can pick to just tape your voice talking over your slides or PDF. While youre tape-recording you can draw on the screen, add text notes to the screen, and emphasize text on the screen..
When you have ended up 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 people who have the direct link to it can view it..
Applications for Education.
PresentationTubes Chrome extension could be a great one for anyone who is trying to find a new, easier method to develop video lessons based upon their existing slides. It just 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 use with PresentationTube.