Funny, I did a couple of searches (one was "youtube kung fu ground fighting" the other was "youtube kung fu armbar on ground") and was actually surprised how much I found (not tons, mind you, but not nothing). Someone who used to (maybe still does) post on here, IronFist108, even has an armbar on ground video...
http://www.youtube.com/watch?v=ncE6CfnBnMI
Guess I'm not as lucky as I thought I was.
Maybe you should search yourself...I'm sure you can tell me what's wrong with all these videos...there's always something wrong.
I study Shaolin and eagle claw by the way, my chin na of course is mostly from the eagle claw. And yes, mostly it is from standing (with either a standing or grounded opponent). Mostly, but not always.