This is the command to make your movie play here in the forum. Change the text in red to reflect the location of your video.
Code:
*embed src="/images/teaser.mov" width="220" height="160" autoplay="true" controller="true" pluginspage="http://www.apple.com/quicktime/download/"*
*/embed*
That will resize your video to the size of the white box. If it needs to be larger or smaller then adjust the numerical value for the width and the height.
Remember replace the astericks with the <>