z-index of dropdown menu vs iframe (youtube) video issue

When you are using iframe to display any video, for example if you are using youtube iframe video and on your site it has a dropdown menu and your dropdown memu is showing behind the iframe video you can make it top of iframe video with below written jquery code.

(function ($) {
    $ = jQuery;
    $(function () {
        $video = $("#parentocontainer> iframe");
        $srcVal = $video.attr('src');
        appendedVal = $srcVal + "?wmode=opaque";
        //or
        //appendedVal = $srcVal + "&wmode=opaque";
        $video.attr('src',appendedVal);
    });
 })(jQuery);