how to add a meta box to wordpress pages - wordpress

Question

i want to make this code for pages
add_action( 'add_meta_boxes', 'meta_box_video' );
function meta_box_video()
{
add_meta_box( 'video-meta-box-id', 'Video Embed', 'meta_box_callback', 'post', 'normal', 'high' );
}
function meta_box_callback( $post )
{
$values = get_post_custom( $post->ID );
$selected = isset( $values['meta_box_video_embed'] ) ? $values['meta_box_video_embed'][0] : '';
wp_nonce_field( 'my_meta_box_nonce', 'meta_box_nonce' );
?>
<p>
<label for="meta_box_video_embed"><p>Video Embed</p></label>
<textarea name="meta_box_video_embed" id="meta_box_video_embed" cols="62" rows="5" ><?php echo $selected; ?></textarea>
</p>
<p>Leave it Empty ( if you want to use an image thumbnail ) .</p>
<?php
}
add_action( 'save_post', 'meta_box_video_save' );
function meta_box_video_save( $post_id )
{
// Bail if we're doing an auto save
if( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return;
// if our nonce isn't there, or we can't verify it, bail
if( !isset( $_POST['meta_box_nonce'] ) || !wp_verify_nonce( $_POST['meta_box_nonce'], 'my_meta_box_nonce' ) ) return;
// if our current user can't edit this post, bail
if( !current_user_can( 'edit_post' ) ) return;
// now we can actually save the data
$allowed = array(
'a' => array( // on allow a tags
'href' => array() // and those anchords can only have href attribute
)
);
// Probably a good idea to make sure your data is set
if( isset( $_POST['meta_box_video_embed'] ) )
update_post_meta( $post_id, 'meta_box_video_embed', $_POST['meta_box_video_embed'] );
}

Answer 1

This:
function meta_box_video()
{
add_meta_box( 'video-meta-box-id', 'Video Embed', 'meta_box_callback', 'post', 'normal', 'high' );
}
Should specify page not post.
function meta_box_video()
{ // --- Parameters: ---
add_meta_box( 'video-meta-box-id', // ID attribute of metabox
'Video Embed', // Title of metabox visible to user
'meta_box_callback', // Function that prints box in wp-admin
'page', // Show box for posts, pages, custom, etc.
'normal', // Where on the page to show the box
'high' ); // Priority of box in display order
}
Take a look at the Codex for add_meta_box(). The examples are very helpful. The portion you are interested in is under "Parameter". The fourth parameter allows you to specify whether you want the metabox on pages, posts, etc.