1- While Im doing tremolo, should I move my fingers only or my whole hand?
2- In technique analysis I've uploaded a video, can plase someone help me with my whole picking technique
To answer your first question, your picking technique should be fairly consistent regardless of what you're doing exactly. As such, I'd say that it should come from your wrist.
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Well, if you can, only move your fingers, but sometimes you gotta get some momentum and use your hand to get the right effect.

If you can't use your fingers only, oh well, no biggy, I just think it's more efficient to use only the fingers...even though I can't use only my fingers..