Add oEmbed support for Google Drive Video

functions.php

<?php

// Add oEmebed support for Google Drive Video
wp_embed_register_handler(
	'google-drive-videos',
	'#https?://drive.google\.com/file/d/([a-zA-Z0-9_-]+)/preview$#i',
	'pb_add_oembed_handler_dgvideo'
);

function pb_add_oembed_handler_dgvideo( $matches, $attr, $url, $rawattr ) {
	$embed = sprintf(
		'<iframe src="https://drive.google.com/file/d/%1$s/preview" width="640" height="480"></iframe>',
			esc_attr($matches[1])
	);
	return $embed;
}