iBooks Author allows anyone to create beautiful Multi-Touch textbooks — and just about any other kind of book — for iPad. This can include galleries, video, interactive diagrams, 3D objects, and more. Please see link below for more information.
1- iAd Producer : Author cool content
2- Dash Code : Create an empty widget
Check this video on how to use Dashcode to create an empty widget. In the next video you will fill this with your interactive content. You need XCode which is available for free for members of the Apple Developers Program.
3- Add content to empty widget and import to IBook project
This Video will detail this step by step and also give you links to download the widget and try it out yourself.
Hope you find this useful for your IBook Author projects