poor quality

As you can see, the video seems to be very jittery/pixelated/wavy. I don't really know how to describe it so haven't been able to find a solution yet. I have messed with the settings to no avail. I am brand new to this and any help would be greatly appreciated. I have attached a link to the...

It seems like no matter what I do, I can't get my iso down to 100 and my videos come out very grainy. If I manually set my iso to 100 and turn down my shutter speed the video just gets really dark, even in a well lit room. Here is an example video shot on auto settings. The room is pretty...