You've got quite a nice boy on your hands I think!!
His trot is ok, he's a little out behind and long in the back with fairly average hocks for my liking, but he's got a lovely length of rein and his knees are quite nice. You could certainly play with it and create a very reasonable trot out of it. I LOVE his walk! Big overtracking hinds, loose shoulders, very nice.
His canter is also quite good. I can't really tell much from the video as it is very short and he is running and on the forehand, but he looks to have a lovely big swinging hind leg. He could certainly come back and take weight over his hinds, although I think he may struggle somewhat with collection as his hocks aren't overly great and he's a little straight and out behind.
Overall, NICE horse
I would much rather a horse with a good solid walk and canter and an average trot, than one with a spectacular trot but average walk and canter. You can easily improve and fake a trot, walk and canter is much harder.