Add the below to your book.json file, then run gitbook install :
{
"plugins": ["youtube"]
}You can now add YouTube videos to your book using this tag:
Take a look at this video:
{% youtube src="https://www.youtube.com/watch?v=9bZkp7q19f0" %}{% endyoutube %}The video will be replaced by the embed iframe in the website, and by a link in the ebook version.