Most domestic camera tripods these days are made out of light weight material (for obvious reasons) but this has the effect of making the tripod unstable and susceptable to vibration and operator movement.
The best thing to do in trying to minumise these issues is add weight. Either a sandbag hooked to the centre section with an octupus strap or even better, buy a dolly. This not only adds weight but gives you wheels as well. It also help stabilise by keeping the tripod legs at fixed distances.
Try it, you will improve your videos!