RichMedia annotations can be used to embed videos and sound files in PDF documents (in the upcoming PDF 2.0 ISO standard). When opened in a compliant reader, the user can play them back directly as part of the page content, usually by just clicking on the video. The following blog post examines how a RichMedia annotation is embedded in PDF, how PDFNet can be used to extract and create the movie data for playback:
http://blog.pdftron.com/2013/09/11/working-with-pdf-richmedia-annotations/