I've pulled the entire hallway from Twin Emps to C'Thun and seen about 7 mounts among the loot, including 2 reds. Provided you know how to handle Twin Emps, you can clear the entire place in no time. If your luck is really terrible, kill all the C'Thun hallway trash and zone out for a soft reset. I'm sure you will get it.
Are you serious? This is perhaps how you did it an expansion ago, right now you just clear the entire instance, you can be pretty sure it will drop at least once.
Not really. Me and a friend farmed this instance all the time past few expansions and took several months before we even saw one. Now I solo clear it on three toons every week (mainly for pets and free gold) and haven't seen it drop since the last time I get it. Instead I usually see about 3x Yellow/Blue/Green and that's it.
Overall though there is no secret in farming this mount so not sure why a video is needed. You go in, kill trash, and pray to RNG gods it'll drop. Rinse and repeat, it's just like every mount that drops off a boss.
Some of the pets sell really well, Viscidus and Twin Emps in particular. It only takes half an hour to solo the whole thing, and can be quite profitable. You also max out a rep and get a bunch of transmog gear. Good times, give it a shot.