How trained are you looking for and how much are you aiming to progress up the levels of dressage? The horse looked sound and not psycho, which is a good place to start. But not much freedom of the shoulder in its movement, nor did it really bring its hocks under it, which are things you want, ideally, for moving up beyond First Level.
Also, it was either unsteady and fussy in the contact and when it wasn't fidgeting about, it looked heavy on the forehand, leaning on the rider's hands. Putting its head down, but not engaging the hindquarters. That's a training issue and solvable one (unless, of course, the fussiness in the bridle is caused by some medical issue). Just depends on whether or not you want to deal with fixing that.