OK - so here is a simple demo code that does that. Note that this of course loads a video from my personal site so please change it to your local files. This demonstrates overriding the poster image, video file and video title.
<html>
<head>
</head>
<script src="http://cdnapisec.kaltura.com/p/2027961/sp/202796100/embedIframeJs/uiconf_id/32020091/partner_id/2027961"></script>
<div id="kaltura_player_1447766358" style="width: 560px; height: 395px;" itemprop="video" itemscope itemtype="http://schema.org/VideoObject">
</div>
<script>
kWidget.embed({
"targetId": "kaltura_player_1447766358",
"wid": "_2027961",
"uiconf_id": 32020091,
"flashvars": {
'titleLabel':{
'plugin': true
},
'mediaProxy': {
'entry':{
'id': "1",
'name': "External video: Wildlife",
"description": "Description here",
"thumbnailUrl": 'http://amirush.com/vidmo/vid/poster.jpg'
},
'sources':[
{
"src":"http://amirush.com/vidmo/vid/wildlife-small.mp4",
"width":"640",
"height":"360",
"bandwidth":"9688824",
"type":"video/mp4; codecs=\"avc1.42E01E, mp4a.40.2"
}
]
}
}
});
</script>
</body>
</html>