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<?php

$api_request    = 'https://www.googleapis.com/youtube/v3/playlistItems?part=contentDetails&playlistId={PLAYLIST_ID}&key={YOUTUBE_API_KEY}';
$api_response   = wp_remote_get( $api_request );
$api_data       = json_decode( wp_remote_retrieve_body( $api_response ), true );

if ( !empty($api_data['items']) ) {
    $i = 0;
    foreach ( $api_data ['items'] as $item ) {
        printf( '<iframe width="300" height="160" src="https://www.youtube.com/embed/%s?&modestbranding=0&rel=0&controls=0&autohide=0&showinfo=0" frameborder="0" allowfullscreen></iframe>', $item ['contentDetails']['videoId'] );
    }
}