Setting up a Plugin SDK integration with HTML5 is simple. First, copy a link to the source video, wherever you have it hosted. Then, place it inside an html5 video object in your P3SDK div as shown below. Make sure the video is given the same id as the player_id in your P3SDK div (highlighted in pink below).
<div class="p3sdk-container p3sdk-debug" player_id="html5-player-6" player_type="html5">
<div class="html5" data-ratio="0.4167" style= "width:560px; height:270px;"><video id="html5-player-6">
<source type="video/mp4" src="http://videos.3playmedia.com/10013/78983/3aba0b861bfc1a970782b09856fb1ff6.mp4">
</video>
</div>
</div>
*The Plugin SDK is sometimes referred to as "P3SDK"