I have only seen one full video of Trey Songz from the 2012 Essence Festival.
Shay Star from Shaystar.com website has a full video of the performance!!!
I'm not sure if the link will be live here, but copy and paste to your web browser!
***FULL PERFORMANCE** Exclusive BRAND NEW TreySongz Live Performance at 2012 Essence Festival - http://shaystar.com/?p=3595 via www.shaystar.com