To modify an existing video and prepare it to be interactive you can download Actio Editor, a program that uses the Ribbon interface that is very easy to use. All you have to do is load the video that you want to modify, and then insert the different interactive objects as the video is played, with the possibility to pause and rewind to put the object in a specific position.
The tools included in Actio Editor are very intuitive, making your job as easy as possible. As well as using FLV videos, that are the most common over the Internet, it also supports other formats like AVI or WMV, with the possibility to transform them into FLV to make them easy to insert in a web page.
Therefore, if you are interested in including interactive videos in your web pages, or you simply want to try out this technique, download and install Actio Editor.