(If I have the resources to make something accessible, and if I value making something accessible to deaf people over other uses of those resources, then of course it's a good thing to make it accessible. Personally, I think making these videos accessible would be a very good thing; I also think that, as long as it's reasonably feasible, the universities should . But the existence of deaf people does not represent any kind of a claim on my (or anyone else's) resources, nor a shackle on my behaviour; and if it does under current, it damn well shouldn't, and that law is unjust and oppressive.)
Edit: For instance, for Hobbes, that pretty much is the definition of the state of nature, in which everyone has the natural right to their own self-preservation and goals. The rise of sovereign power is often conceived of as the enforcement of obligations that override natural rights to complete liberty (through something that is probably even more properly called "thuggery" than deaf advocacy groups' political actions).
It just defends negative rights, instead of positives ones, not a lack of rights and obligations. See Isaiah Berlin's Two Concepts of Liberty[2].
EDIT to your EDIT: in Hobbes' state of nature, everyone has the right do to whatever one thinks is necessary for one's own preservation (including, say, killing others). For Rand, one has the right to not be attacked by others, even if that goes reduces the others' chances of self-preservation. The two are very different, and the latter does impose (negative) obligations on individuals towards others.
> To destroy other people's access to a good because you have the power to, in order to coerce them into acting so that you receive such a good yourself, is wrong.
Sorry, Ms Parks, but you can't sit in that seat...