On occasion, like perhaps this(?), a video has to be watched rather than described because it's purely the dynamic visual content which is pertinent. But when otherwise, that's why I'd prefer isolating / posting a quote from the transcript of a video lecture or interview over referencing a part of it by:
"You just sit through the first eleven minutes till you get to where ___ is talking about ___ or ___ is happening. Or try jumping ahead and maybe you'll hit the right spot after a few attempts. Oh, you're one of those people who keeps Flash, etc, disabled 90% of the time because of security issues. Well, darn..."
If there is no link to a transcript provided (which is probably the case 99.999..% of the time on places like YouTube), then it's pffttt!! to utilizing the thing even indirectly (i.e., a forum merely supplies recreational needs, it's not a bloody job where spending _x_ minutes / hours personally transcribing footage is obligatory). AFAIK, I have never watched a single video submitted to SF. So that "gotta ambulate the ambulation" stuff, or whatever the applicable cliche adage is

, would become my ball and chain in reverse, anyway.