thank you everyone for your help at first I was planning on streaming video from my GoProHero3 WIRELESSLY to my mac then upload to the Internet (live) but the problem is that when you connect the GoPro to the mac, you must join the wireless network the GoPro creates, which means you have to drop your wireless Internet connection. So I would have to do a wired setup which isn't that big of a deal.
Now I can either use a usb to composite cable or a mini HDMI to HDMI cable. Which would be the better option (I'm assuming HDMI) and what device would be the best option to connect the 2 GoPros to my computer.
I checked the links you posted deevey but it seemed like only one of them would connect to my computer via usb but its composite and I would need to buy 2 since there is two cameras. I'm looking for a plug and play solution GoPros > Interface > Macbook > Livestream