Not exactly a smooth automated process (the timing could be better on some of the lines), but my Pantheon novel trailer now is close captioned for your viewing pleasure on YouTube.

(And another public thanks to the great Debbie Irwin who does the fantastic voice-over!)

To turn close captioning on and off, look for the CC icon at the bottom of the video window (which may or may not only show up on the actual YouTube site instead of in an embedded window).