Books are about reading. But with videos, not so much.
So, if you're going to make me read a long scroll of text, you'd better be sure it's a clean, easy-to-read typeface, and not in all bold caps. That will just enrage me and compel me to write a snarky review about your book trailer.
Kudos for keeping it at 40 seconds, and I see there's a follow up video, which I won't watch.
The image of your book cover at the end is quite stunning. There. I ended on an up note.