Get path parameter in views-view-fields--portfolio.tpl.php file
borrowed from here

// field_video_image is the name of the image field

// using field_get_items() you can get the field values (respecting multilingual setup)

 $field_video_image = field_get_items('node', $node, 'field_video_image');


// after you have the values, you can get the image URL (you can use foreach here)

 $image_url = file_create_url($field_video_image[0]['uri']);