Authors ask me if they need a book trailer to promote their book. If you think your audience is net savvy by all means use a book trailer. Make sure it looks professional and is relevant to your book.
It can be difficult to do yourself without a quality camera and sound equipment. You also need a program to edit the video and add titles etc. Sometimes it better to leave it to a professional and this costs money.
Here’s some book trailers from Zeus authors:
Let me know what you think and how effective they are at highlighting the book synopsis. Would it make you want to buy the book?