You can get the selected page for posts by the following code:
$page_for_posts = get_option( 'page_for_posts' );
Then, get the requested post by:
$post = get_post( $page_for_posts );
And, get the data you need:
echo apply_filters( 'the_title', $post->post_title );
echo apply_filters( 'the_content', $post->post_content );
echo get_post_meta( $post->ID, $key, $single);