All sources can be cited without falling afoul of "original research" Original research only covers claims without sources at all, or claims made from yourself as the source. Any source, including citing to a video interviews, is never original research.
Ideally of course, yes. However it is quite hard to work with primary
sources of this nature (i.e. ones that are not summarising a subject) and avoid interpretation (which is at the core of OR). It is perfectly possible to cite an iron clad reliable source and still end up doing original research :) It's just that the risk is greater with these forms of sources.
I don't really get by the way, why this is considered revolutionary. These aren't "oral citations" in the standard sense, these are citations to a published video.
Reliability depends on a number of factors; for a video it depends on things like the identity of the person speaking, the publishing body, etc.
Raw footage of this sort is very much primary sourcing with potential reliability problems.
The key thing for reliable sources is the idea of *fact checking or peer review*. This is why the very best sorts of sources are those published in respected scientific journals - because they have been reviewed for mistakes, bias, etc.
Ideally these videos would be published as a primary resource, interested parties would synthesise material and write papers (or give lectures, or publish a book) - secondary sources - which could then be cited by tertiary sources, such as us :)
Currently you would have to treat these videos with a modicum of care, under the usual guidelines for primary source material.
Tom