I count 2 inputs and 1 bi-directional.
But, I an unfamiliar with the camera module used with an Uno; which is to say my guess is code (or timing in the code.)
A forum search lead me to:
OV7670 with both arduino uno and now mega - Using Arduino / Sensors - Arduino Forum
Which indicates success: start with that codebase is my suggestion.
At this juncture, having used the Uno directly connected to the camera, I can not know if the camera module is still "good." Only wiring correctly with known working code will provide you with confidence your hardware is working correctly.
Arducam OV7670 0.3 Megapixel Camera Module for Arduino Boards - Arducam
