add_filter( 'streamtube/player/file/output', function( $player, $setup, $source ){

    if( $setup['sources'][0]['type'] == 'video/youtube' ){

        wp_dequeue_script( 'player' );
        wp_dequeue_script( 'videojs-youtube' );

        $player = sprintf(
            '<div class="container2">%s</div>',
            wp_oembed_get( $setup['sources'][0]['src'] )
        );
    }

    return $player;

}, 2, 3 );

add_action( 'wp_footer', function(){
    ?>
    <style type="text/css">
        .container2 iframe{
            position: absolute;
            left:0;
            top:0;
            width: 100%;
            height: 100%;
        }
    </style>
    <?php
} );