Lumia Icon :: Sound While Camera Auto Focusing?

I just purchased a Lumia Icon recently and on going through and testing out various functions, I noticed that the video recording has an odd noise whenever the camera autofocuses.

The device is up to date on everything, Windows 8.1 and Lumia Denim with the latest camera app.

Here is a sample of it (close range, but it does the same noise when focusing on anything )

Right near the end I switched it to manual focus (the "jump" in focus you see and possibly the sound when that happens), but then switched it back to auto which is the noise starting again.

This happens in both surround sound mode and not.

I'm just wondering if this is normal or not. All the sample videos I have looked for either have someone talking or music playing over the video audio itself, or else what is being recorded is noisy enough to possibly hide the autofocus noise if it exists.