function videotube_add_post_view_bottom( $content ){
    $post_view = videotube_get_count_viewed();
    if( is_main_query() && is_singular( 'video' ) ){
        $content = sprintf( _n( '%s view', '%s views', $count, 'videotube' ), number_format_i18n( $post_view ) ) . $content;
    }
    return $content;
}
add_filter( 'the_content', 'videotube_add_post_view_bottom', 10, 1 );