Camera OUT - Dry contact

Hello there,

we are having trouble with camera which has to open the garage door.

I tried every possible way to connect a 5V from camera usb port to 5V Relay and no luck.
Where can I get exaples of this kind of circuit.

I need the solution ASAP.

Thank you!

mx rs 232 box than you have asap a solution

We managed it, but are there any examples of simple relay circuit?