Like most DSLRs of its generation, the D3200 suffers from "rolling shutter" (the image skews when you pan the camera quickly) and occasional moiré (weird wavy patterns) when filming brick walls or fine fabrics. You have to move the camera slowly and choose your locations wisely to avoid these artifacts.
The D3200 is a fantastic for video. Upgrade when you need: nikon d3200 for video