Here for the past few weeks or so my power steering makes a lot more noise than normal it seems.
When the vehicle warms up or when it's warm outside it seems to quite down. Fluid levels are good also. It didn't seem to start doing it until I got the timing belt and water pump replaced....
Don't know if this helps, there is also a odd noise that sound like maybe the bearings for the pulley are going out? I'm not sure, but you can't here it on the video.