i wish to get this to code for pages thanks advanced

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'] );

}

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
}

Have a look in the Codex for add_meta_box(). The good examples are extremely useful. The portion you are looking at is under "Parameter". The 4th parameter enables you to definitely specify whether you would like the metabox on pages, posts, etc.