For any reason you do not want to use services like YouTube or Goear for saving your video or audio files, the Interactive Video Plugin is a supplement for WordPress that allows you to add multimedia content to any post published through that content system.
To install the interactive video plugin, follow the steps described in the readme.txt file. After activating it, you can upload your multimedia files to the blog in two different ways: physically save them on your own server and publish a link to the post or 'Add interactive video' using the option, which will save your assets at Kaltura.com .
The main advantage of using the second option is to unveil the possibility of using an online video editor that will help you to combine different video clips together and apply transitions and effects. Other options that you can add from this option are as follows: Webcam shots and videos from YouTube, MySpace, and Kaltura.
Requires WordPress 2.5 or higher.