Unfortunately, we don't have transcripts for all our videos.
However, for our videos that are hosted on YouTube you can access the autogenerated transcripts in the desktop view. (On a mobile device you can turn on CC captions.)
If the video has a YouTube logo on it... click on the logo. It'll open in YouTube, then, you can look for the 3 little dots that indicate more features. Under there you can turn on the transcript view.
Here's a screen capture:
For other videos, it's on our wish list too.