If the main purpose is to shoot video and portability is not a problem, I would go for a heavier tripod with a video head.
#1, get a good tripod.
Lightweight and carbon fibre tripods are fantastic for carrying around with you, but when you shoot video heavy and solid means more fluid movement. The video heads, particularly the fluid heads, allow much smoother panning than the typical ball-head. (ball heads give jerky uneven movement when panned and are harder to level) Make sure your tripod can get to the height you wish to shoot at and still be stable when panned. Note that you can put your camera bag (or a big container of water) under your tripod and tie a rope from it to the bottom of your tripod to increase stability. A sudden gust of wind and a tall lightweight tripod can quickly become a very expensive crash to the ground.
For video, definitely this. Especially the video head, rather than a ball head. Fluid head if possible, but those start getting expensive. Ball heads are much more difficult to use for video, especially if you intend to pan.