Interfacing capabilities and howtos of Arduino Boards

Hello. I have following questions:

  1. What additional hardware is necessary to connect OV7670 with fifo to Uno or Mega?
  2. Is it possible to connect 2 cameras (OV7670 with fifo) to Uno or Mega (or any other Arduino board) and what additional hardware is necessary?
  3. Is it possible to process pixel level information from the camera (e.g. if the specific pixel color of the specific image equals to red, light up an LED or do something else)?
  4. Is any Arduino board capable to connect and manipulate 2 cameras, 2 audio input devices (e.g. microphone), a speaker, a gyro sensor and 4 or 5 motors? If yes, what additional hardware is necessary?
    Many questions, but this is the right place to ask. Thank you in advance.