PresentationTube is a non-profit that has provided a totally free service to teachers for several years. That service is the ability to tape-record video presentations based upon PowerPoint pdfs and files. Just recently, PresentationTube released 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 webcam switched on or you can pick to simply tape-record your voice discussing your slides or PDF. While youre tape-recording you can make use of the screen, add text notes to the screen, and emphasize text on the screen..
When you have ended up recording a discussion with PresentationTubes Chrome extension you can submit it directly to the PresentationTube website where you can then publish it openly 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 a good one for anybody who is looking for a new, easier method to create video lessons based upon their existing slides. Unfortunately, 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 always download your Google Slides as PPT or PDF to utilize with PresentationTube.