Insert html5 video

Hi there – I would like to include a video on my page and have tried HTML5 code – have tried the following code but the video appears but the all other page elements disappear!

any advice?
(would prefer not to use YouTube/Vimeo embedding)

Thanks Andy

This code in functions .php

function html5_video($atts, $content = null) {
extract(shortcode_atts(array(
“src” => ”,
“width” => ”,
“height” => ”
), $atts));
return ‘<video src=”‘.$src.'” width=”‘.$width.'” height=”‘.$height.'” controls autobuffer>’;
}
add_shortcode(‘video5’, ‘html5_video’);

This following shortcode in page:

[video5 src=”https://your-site/videos/your-video.mp4&#8243; width=”720″ height=”480″]