The video is nothing but a data file of bytes.
Just read the video file byte-by-byte and send it to the server or client (I presume the client needs the file).
This will work. To actually broadcast a video stream - such as Windows Media Services or RealServer does you need a more complex platform.
I think that the fastest approach is to send it via HTTP and receive in a browser
I have been trying a solution using activex components, really easy to setup. And the server part is as easy as expose it through http using tomcat or something like. Even without the need of JSP or Servlets
Take a look at this
http://forum.java.sun.com/thread.jspa?threadID=765826&messageID=4367894#4367894