He looks like a lovely fellow to me but I haven't watched the video as yet. Has he been put through Keuring as that often gives you a good idea but he seems to have pretty decent breeding. The Friesian horse is judged based on the average with the goal towards 'ideal' through the Keuring. For example, if the average Friesian is a little short in the pastern (they are) then a mark between 1 and 10 (1 being extremely short, 10 being extremely long) will be given with 5 being the average so, if your horse is a little short, it will be marked 5. There will be a shaded box which is the ideal, the ideal might be a 6 or 7 so encouraging breeders to breed for a slightly longer pastern. If in future years the average Friesian has a good length of pastern, the shaded 'ideal' will be shifted back to a 5. I hope I have explained it ok but it was absolutely amazing to watch and be involved in!
The Friesian was originally developed as war horses ;) It was later that they became popular harness horses and now in recent times they are again being targeted more again as riding horses although are certainly still driven.