The easiest way might be to use the HTML5 <video> element, and just not include any controls, but rather just "autoplay" (if you really want to annoy your users ):
<video autoplay poster="video.jpg">
<source src="video.mp4" type='video/mp4'>
<source src="video.webm" type='video/webm'>
A better option would be to use a custom script with the video, like video.js, which will offer you more options over which controls to include and which to exclude.