/**
 *
 * Filter the query args before run query.
 *
 */
function videotube_child_filter_side_widget_args( $query_args, $widget_id ){
    if( $query_args['post_type'] == 'video' && $widget_id == 'mars-videos-sidebar-widget-11' ){
        $query_args['author'] = get_the_author_meta( 'ID' );
    }

    return $query_args;
}
add_filter( 'mars_side_widget_args', 'videotube_child_filter_side_widget_args', 10, 2 );