View the source code of this page to better understand how video is included. Note that I code for controls so the video does not start playing immediately. I can also code for a poster (jpeg image) to serve as a placeholder (if desired) using the poster attribute on the <video> element.
Try this page in multiple browsers. I am not using a streaming server so the file may take a while to download. Works fine in Safari. Not so good in most others (yet). The file will begin playing automatically once it is downloaded.