bbp_topic_content_autoembed_paragraph( $content )

function bbp_topic_content_autoembed_paragraph( $content ) {

	// Check if WordPress already embed the link then return the original content.
	if (strpos($content,'<iframe') !== false) {
		return $content;
	} else {
		// Find all the URLs from the content.
		preg_match_all('#\bhttps?://[^,\s()<>]+(?:\([\w\d]+\)|([^,[:punct:]\s]|/))#', $content, $match);
		// Check if URL found.
		if( isset( $match[0] ) ) {
			$html = '';
			// Remove duplicate from array and run the loop
			foreach ( array_unique( $match[0] ) as $url ) {
				// Fetch the oembed code for URL.
				$embed_code = wp_oembed_get( $url );
				// If oembed found then store into the $html
				if (strpos($embed_code,'<iframe') !== false) {
					$html .= '<p>'.$embed_code.'</p>';
				}
			}
			// If $html blank return original content
			if ( '' === $html ) {
				return $content;
				// Return the new content by adding oembed after the content.
			} else {
				return $content.$html;
			}
			// Else return original content.
		} else {
			return $content;
		}
	}
}