A video won't help. IMHO, you'll get more recruitment as you gain more experience w/ the lift. LIke I said, I used to question why people thought DL was so great b/c I didn't feel it work very much but as I've gotten more used to it and moved up in weight, believe me, I feel muscles firing strongly that didn't fire before. Better than a video, think about the anatomical function of the lats. They pull the humerus (upper arm) back from an outstretched position. Hence the lats working in the pullup or bent row position. Now, when you deadlift, you stand straight up with the weight, but to prevent your hips from shooting up and then straight legging it the rest of the way, you have to keep your shoulder blades tight, pulling the bar back toward you as you come up. If you just hunch the shoulders forwad and more or less relax them, then you probably won't get much lat contraction. But if you're trying to keep upright, you really have to try and keep the bar in as tight to your body as possible, IMHO. Part of keeping upright and not just straightlegging it is keeping your arms drawn back into your torso, so the bar stays close to the thighs and doesn't just dangle out in front of you. IOW, if you let your torso bend forward at the waist, you wind up w/ your legs and torso at a 90 degree angle to each other, and as a result, your arms just dangle out in front, kind of like they're in teh bent row position. In contrast, if the hips and shoulders rise at about the same time, your torso stays upright and your lats fire like hell, trying to keep the bar from swinging out in front and pulling you into that bent over position.
HOpe that jumble of words helps. LoL