I haven’t seen the DVD in question, but it would not surprise me if within the DVD or the accompanying booklet other aspects besides postures and verbiage would not be familiar to the Hindu. Only those with the DVD and the associated reading material will be able to answer. Discussions covering everything from regulating your breathing, repeating mantras, the emptying or silencing of you mind etc are not covered.
It’s not the physical aspects that concern me, rather the spiritual ones. Yoga and Hinduism is less concerned with the flesh then it is in acquiring access to a spiritual consciousness separate from God.
That in itself makes it dangerous. As you know its powers and principalities that we war against. Hinduism utilizes Yoga as a method towards a higher consciousness. So it’s not food we are talking about, but a metaphysical practice. Do we as Christians want to achieve the same consciousness that a Hindu does, through their methodology? I would say no, and my hope is that all Christians would say no.
By the way I'm not condemning anyone. Scripture is also a guide for us to us and when necessary to correct and guide people. Only with Love brother, only with love.