I was supplying it 12V. What I should've done is limited the current... Sigh, costly mistake.
Luckily, I participated in an IoT hackathon recently and have another board albeit the Arduino version. So I swapped the fried Edison with that one and verified it was not powering up. However, putting the working edison on the mini break out didn't work either. It looks like I fried both the mini break out and edison.
Well, lesson learned... But I still can't understand why a USB camera can cause this... BTW, I was using a Mobius Actioncam in usb webcam mode. Stay away from this camera on this board...