For some reason your machine appears to be running very slow on some segments, and seems to get up to speed on longer straight cuts. In order to get best quality with plasma the speed must be constant, and must be very close to the specifications provided in the Hypertherm manual. I cannot tell what pwer level or consumables you are using, but from the apparent speed and brightness of the arc, it looks as though you may be using too much power, not enough cut speed for the material you are cutting. It is always best to use the smallest consumables and lowest power for the material you are cutting....if you want the best quality.
Overall...it looks like you are getting close! Nice work!