If what you're looking for is video dealing with technique, I would strongly suggest that you consult your current instructor to find the resource that is the most exemplary in terms of the lineage in which you train.
That said, the development of martial technique depends on skill in the art of ukemi. In that respect, without regard to the lineage in which you train, there's no question in my mind whatsoever:
Ellis Amdur's Ukemi from the Ground Up
You will be doing your body a huge favor without sacrificing any martial efficacy or adopting a system of ukemi that inevitably compromises your training partners' martial efficacy, and the longer you train, the clearer the benefit will become.
Best regards,
Fred Little