remove_action('videotube_pagination', 'videotube_pagination', 10, 1);

function videotube_wp_pagenavi( $query = array() ){
    if( function_exists( 'wp_pagenavi' ) ){
        wp_pagenavi( array(
            'query' =>  $query ? $query : $GLOBALS['wp_query']
        ) );
    }
}
add_action( 'videotube_pagination', 'videotube_wp_pagenavi', 20, 1 );