There are plenty of businesses that will create book trailers for authors, but costs can vary greatly depending on the complexity and length of the video. You can, however, do the work yourself with a couple of computer programs and a few hours of your time.
Basically, all I did for my book trailer was create a slideshow using text and still images, added music to the slideshow, then ran the slideshow through a program that converted it into a mp4 video file. It took me several hours and several drafts before I was satisfied with the finished product, but that is partly because I enjoy tinkering with such things, and because I was learning as I was going.
The Trailer Slideshow:
For the slideshow I used Microsoft PowerPoint because the program was already available on my computer. If you have a Windows based machine with Microsoft Office programs, PowerPoint may also be on your computer. If not, other slideshow programs are available that will work for your trailer.
Many of the images in my book trailer are personal images, but I also found photos through the NOAA (National Oceanic Atmospheric Administration) site, which are free to use as long as you give NOAA credit. I also purchased a few photos from the Bigstock Photos website, which cost $1 to $3 each. Several websites offer free clip art and photo stock, but make sure your anti-virus software is up to date before going to sites you are not familiar with.
The text in my trailer consists of text boxes placed on a slide in the slideshow program.
In my trailer I used royalty-free music. You can search the web to find royalty-free music that is made for this type of use. One example of a royalty-free music site can be found at: http://incompetech.com/music/royalty-free/
Once my slideshow was complete, I ran the file through a program called the Moyea PPT to Video Converter that turned the PowerPoint file into a mp4 movie file. The program can be found at: http://moyea-ppt-to-video-converter.en.softonic.com/
When your video file is done, post it on You Tube. From there, it is easy to embed the video file on a website, blog, your Author Page on Amazon, and other places, plus your trailer gets views from You Tube visitors.
As examples of book trailers, I have included four below. The first is the trailer I made for my book, South to Alaska, which is nonfiction. I have also included trailers for a historical fiction book, a fiction book, and a children’s book by other authors. Although I’m not sure of what process was used to create the other three trailers, they also appear to have been made using still images and blocks of text, so nothing too fancy here that can’t be done with a slideshow and video converter.
If you are interested in creating a book trailer, go to You Tube and key in "book trailer" to see more examples.
Have you thought about making a trailer for your book?