If you are connecting a scope to a USB camera, you're not talking about that...
However if you are trying to read TTL serial communications on a scope, try How to read serial data from oscilloscope - Electrical Engineering Stack Exchange for a bit of guidance. You should be able to write up a program to loop writing a specific character to the serial port so that you can catch it for analysis. But only after you put the USB camera in a different room to the scope. lol