Thanks for the comments :)
avi8tr, Yes its a GoPro HD hero 3 Black Edition.
The GoPro 3 uses the USB port as a sound input also, from their site i got an adapter to connect the USB port to 3.5mm Jack (http://gopro.com/camera-accessories/3-5mm-mic-adapter)
then from ebay got a 3.5mm (male) to 6.35mm (male) cable and connected it to the adapter and into the rear headset jacks in the aircraft.
The sound is a bit muffled when i talk for some reason, however when i talk to ATC its clear.. trying to figure out the reason for that but it does the job for now :)
Thanks
Kane