Código PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Documento sin título</title>
</head>
<body>
<object id="VIDEO" width="320" height="240"
style="position:center; left:0;top:0;"
classid="CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6"
type="application/x-oleobject">
<param name="URL" id="ej" value="">
<param name="SendPlayStateChangeEvents" value="True">
<param name="AutoStart" value="false">
<param name="uiMode" value="none">
<param name="PlayCount" value="9999">
<param name="enableContextMenu" value="">
<param name="Settings.balance" value="0">
</object>
<form action="" enctype="multipart/form-data">
<input type="file" name="file" onchange="document.getElementById('VIDEO').getElementsByTagName('param')[0].setAttribute('value',this.value)" />
</form>
</body>
</html>
Pero ya te dije que obtendrás diferentes resultados dependiendo del navegador.