Html->url('/pdf_viewer/files/cookbookdemo.pdf',true); //Using true for full url, cookbookdemo.pdf is an example in the webroot of the plugin
$vieweroptions = array(
'pdfurl' => $pdfurl,
'class' => 'span6', //Class you want to give to canvas, use your own class. I use TwitterBootstrap so therefore i use the span6 (half page) class.
'scale' => 2.0, //The 'zoom' or 'scale' factor. I use 2 for making the PDF more sharp in displaying.
'startpage' => 1, //Starting page
);
//Get the PdfView element that renders the PDF
echo $this->element('PdfViewer.viewer',$vieweroptions);
?>