This is a great trick someone figured out a number of years ago.
The idea is that if you have a lower end tripod, you know how difficult it is to get a smooth pan/tilt because it's either not a true fluid head, or maybe just a poor one. Higher end fluid heads do the job of making pan/tilts smooth, but if you think about it, the head is actually smoothing out YOU, your hand that is, because we humans don't have a silk smooth ligature. you can verify this by loosening up your tripod head all the way, and see just how good you can do without any fluid dampening. It likely wont be fantastic.
So enter the rubber band. Rubber is an excellent shock absorber, and that property works great in this application. You simply loop the band around the tripod handle, and hook the other end with your finger. I wouldn't call it foolproof, but it has a great chance of improving on your video's smoothness. It's ultra cheap and/or free, so there's no reason not to give it a shot.