From version 1.8.2 onwards, a new parameter is available: embedcode

This parameter allows you to use the new embed code (iframe) or the old embed code (object).

Its possible values are: new (iframe, default) or old (object).

Here’s an example:

Shortcode used:

[youtube_sc v=http://youtu.be/5LOcUkm8m9w embedcode=old]