var video = document.createElement("video");
video.preload = "auto";
video.src = 'scr/to/file.mp4';

video.addEventListener('loadeddata', function() {
video.currentTime = 10;
}, false);

video.addEventListener('seeked', function() {

var c = document.createElement("canvas");
var ctx = c.getContext("2d");
c.width = 800;
c.height = 450;
ctx.drawImage(video, 0, 0, 800, 450);

Uppod({
m:"video",
uid:'videoplayer',
file:'scr/to/file.mp4',
poster:c.toDataURL(),
st:"uppodvideo"
});

}, false);