If you're a web developer or designer familiar with CSS and JavaScript, this tightly focused introduction shows you how to add HTML5 media elements to your web pages, and how to provide custom controls for letting web visitors interact with the content. You'll also learn how to provide subtitles and captions, using file formats that work in browsers now . This book includes code samples and downloadable examples to help you take full advantage of audio and video in your web pages.
This is excellent book for the HTML5 Media. It contains all that you can do with the video and audio tags in HTML5 until now. It is a quick read that has a lot of links to other sources where you can read more about specific topic.
I found the part for creation custom HTML5 video player very useful and interesting.