Although it is a very basic question.
Is there a protection circuit within the I2Cs terminal of ADV7513?
At the same, Is the pin processing in cases of unused? Dase it connect to GND?
I assume you are talking about the DDC I2C pins instead on the control I2C pins. The DDC I2C pins are 5V tolerant and will have the normal ESD protection that the other pins have. If you are not using DDC I2C then you can weak pull the pins to 3.3V. If you need more protection you can always add external ESD protection circuits.
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