function videotube_redirect_login_page(){

    // an array of page IDs
    $page_ids = array( 64 );

    if( ! is_user_logged_in() && is_page() && in_array( get_the_ID() , $page_ids ) ){
        wp_redirect( wp_login_url( home_url('/') ) );
        exit;
    }
}
add_action( 'wp', 'videotube_redirect_login_page' );