That vid looks good. The short terms being within 10% is normal and yours dont really go past 15%. Both banks are running slightly rich. What is encouraging is the short terms look like they are responding to the o2's, which means the computer is not intervening.
Without a reading on the cam sensor, I can't confidently say on a forum that you need to replace it. If you do end up getting a look at it,there is no specific voltage you are looking for, except a signal switches from high to low as the cam sync spins around. The signal will increase in voltage and frequency as the rpm increases. This may be a cause of the extra fuel being fed into the motor.
IAC codes can be a symptom of something else. The valve will be a 2 wire design. Unplugged the power feed will show battery voltage, the other wire will be the control wire. To test them you need to plug the sensor in and backprobe the control wire.
A testlight connected to battery positive on the control wire will close the pintle on the
IAC and drop the rpm.
Conversely, a testlight on battery negative on the control wire will open the pintle fully on the
IAC, raising rpm.
If you are able to lower and raise the rpm via bypassing the computer, the
IAC is fine.
The computer will have a desired rpm and
IAC count which is how it monitors this circuit. There are no other feedback loops that I can see. For example let say there is a vac leak. On a
MAF engine this will drop rpm at idle as the extra air will be after the
MAF. To counter this the computer may command the
IAC to open more to raise the rpm.
From the video, it didn't look like the
IAC was working overtime at all. Maybe just keep an eye on it. Just a theory, but thinking vac leaks often lead to a slightly rich condition.