congratulations on your purchase!
Seeing your video, the sound is rather distracting - but it's hard to evaluate without any recognizable ambient sounds to help assess the level of noise. If there were people in the room talking at a normal level, it would be easier...or some other sounds to sort of baseline the overall amplification level of the audio.
Nevertheless, it does appear to be quite noisy when the camera adjusts the AF. None of the reviews I have read, mention this as a drawback - which could indicate that what you are experiencing is above the norm.
It can't hurt to investigate this further with your dealer and do a comparison, just to see if your sample is noisier than it should be.