How to set the thumbnail image on HTML5 video?

Question

Is there a way to set thumbnail image on HTML5 video? I want to see some pictures before play. My code looks like this:

Answer 1

1) add the below jquery:

$thumbnail.on('click', function(e){
 e.preventDefault();
 src = src+'&autoplay=1'; // src: the original URL for embedding 
 $videoContainer.empty().append( $iframe.clone().attr({'src': src}) ); // $iframe: the original iframe for embedding
 }
);

note: in the first src (shown) add the original youtube link.

2) edit the iframe tag as:

note: copy paste the youtube video id after the embed/ in the iframe src.