[WordPress] Code from our blog post Passing Parameters to a Video Link in a WordPress Custom Field - http://www.limecanvas.com/passing-parameters-to-a-video-link-in-a-wordpress-custom-field/

code-snippet-1.php

// Filter video output
add_filter('oembed_result','lc_oembed_result', 10, 3);
function lc_oembed_result($html, $url, $args) {

    // $args includes custom argument

	$newargs = $args;
	// get rid of discover=true argument
	array_pop( $newargs );

	$parameters = http_build_query( $newargs );

	// Modify video parameters
	$html = str_replace( '?feature=oembed', '?feature=oembed'.'&'.$parameters, $html );

    return $html;
}