We don't yet have transcriptions and subtitles for everything on the site BUT if you watch the module on Google Chrome, there is a new feature (you don't need to download any external app or extension) that will give subtitles (in English only!) to any video you are watching on your browser.
Go to Optimize on google chrome > go to the module and hit play > then click this little button with the music note and hit "live captions" and voila! it will start to share in written form everything Brian says! (Example here!)
Let us know how it goes!!