WordPress: Simple metabox script

<?php
/* A simple way to create metaboxes in WordPress */

add_action( 'add_meta_boxes', 'video_meta_box' );
function video_meta_box()
{
    /*
    http://codex.wordpress.org/Function_Reference/add_meta_box
    add_meta_box( $id, $title, $callback, $post_type, $context, $priority, $callback_args );
    */
    add_meta_box( 'video_meta_box', 'Video', 'video_meta_box_setup', 'post', 'normal', 'high' );
}

function video_meta_box_setup()
{
    global $post;

    /* http://codex.wordpress.org/Function_Reference/wp_nonce_field */
    wp_nonce_field( plugin_basename( __FILE__ ), 'video_meta_box_nonce_name' );

    /* we take the data stored separately here... */
    $video_id = get_post_meta( $post->ID, '_video_id', true);
    $video_image = get_post_meta( $post->ID, '_video_image', true);

    /*
    If you have stored all data in one array.....
    $video_data = get_post_meta( $post->ID, '_video_data', true);
    $video_id = $video_data['video_id'];
    $video_image = $video_data['video_image'];
    */
?>
    <table class="form-table">

        <tr>
            <td><label for="video_id">Informe o ID do vídeo</label></td>
            <td>
                <input class="regular-text" type="text" id="video_id" name="video[video_id]" value="<?php echo $video_id?>" />
            </td>
        </tr>

        <tr>
            <td><label for="projeto">Informe a URL da imagem do vídeo (thumbnail)</label></td>
            <td>
                <input class="regular-text" type="text" id="video_image" name="video[video_image]" value="<?php echo $video_image?>" />
           </td>
        </tr>

    </table>

<?php }

add_action( 'save_post', 'video_meta_box_save' );
function video_meta_box_save( $post_id ) {

      // verify if this is an auto save routine.
      // If it is our form has not been submitted, so we dont want to do anything
      if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
      return;

      // verify this came from the our screen and with proper authorization,
      // because save_post can be triggered at other times
      if ( !wp_verify_nonce( $_POST['video_meta_box_nonce_name'], plugin_basename( __FILE__ ) ) )
      return;

     //check permissions
     if ( ! current_user_can( 'edit_post', $post_id ) ) return $post_id;

     $video = $_POST['video'];

     /* To store in separate meta fields */
     update_post_meta( $post_id, '_video_id', $video['video_id'] );
     update_post_meta( $post_id, '_video_image', $video['video_image'] );

    /* To store all data into one array
     update_post_meta( $post_id, '_video_data', $video );
    */

     return $post_id;
}
?>