Printing OEmbed URL based on Post selected w/o page refresh

wp_oembed_get() returns the whole iframe, that’s its purpose. So you should use it on its own, not in the src of an iframe.

$url = esc_url( get_post_meta( get_the_ID(), 'video_oembed', 1 ) ); 
echo wp_oembed_get( $url );

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)