Well you're getting power to it, so the only issues it could be is the wiring leading up to it (hot wire) or power leaving it (ground wire... I'm not original, df2x4 beat me here again). Pull out the multimeter and see what voltage you're getting at the positive, if you're getting the 12+V you need, then the problem is with the ground. I couldn't get sound on the video, so I'm not sure if you explained anything we're guessing at, but if every other light is working correctly, it's a bad connection either leading up to, or leaving that bulb.