WordPress ‘add_action’ content to ‘postbox-container-1’ in admin section

Solution:

First, you need to register your meta box. You could use add_meta_boxes_page hook.

add_action( "add_meta_boxes_page", "se20892273_add_meta_boxes_page" );

// Register Your Meta box
function se20892273_add_meta_boxes_page( $post )
{
    add_meta_box( 
       'se20892273_custom_meta_box', // this is HTML id
       'Metabox Title', 
       'se20892273_custom_meta_box', // the callback function
       'page', // register on post type = page
       'side', // 
       'core'
    );
}

Then use the callback function to generate the template

function se20892273_custom_meta_box( $post )
{
    // you will get the $post object
    // do your stuff here
}

To save any input value used on your meta box, use ‘save_post_page’ hook.

add_action( "save_post_page", "se20892273_save_post_page" );
function se20892273_save_post_page( $post_ID )
{
    if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) 
        return $post_ID ;

    if( isset( $_POST['input_name'] ))
    {
        update_post_meta( $post_ID, '_w4_template', $_POST['input_name'] );
    }
}