Black horizontal bar on the bottom of my tv when I try to record with my camcorder?

I was hoping to record some gameplay of me playing a game on my wii, but when I try to record, a black horitzontal bar takes up the bottom half of my tv and ruins my recording. I have a JVC mini DV camcorder (not sure of the model since the box is buried in my closet), and the tv is a Sylvania. Can anyone help me? I'd like to be able to record my gameplay.|||You may have the settings wrong on the camcorder and it's recording in widescreen. Try switching to full screen