Most people prefer to do opposing camera shot, like how my videos were for a while, but once I got my tripod, I preferred to do an over-the-shoulder shot. It's more convenient for me, and works great when teaching tutorials on tricks or flourishes. Also, you don't have to fumble around with seeing if you cards are turn the right way, or your out of range.
Also, when reviewing decks, I depends what kind of review you want to do. Do you want to review decks based on their design, or on how good they handle? I review decks based on design because 1) I don't want to have to own multiple quantities of every deck, and 2) I don't really use specialty decks for magic, so there is no need for me to test their condition. Anyways, I'll tell you what to review in both type of review styles:
::Design::
Basically, review everything about the deck as far as appearance goes. This includes: AoS, Tuck Box, Jokers, Additional Ad Cards, Court Cards (If Customized), Back Design, ect. Give you opinions on the deck: Whether you like them or not, why, what you hate/like about the deck, ect. That's pretty much all I can think about on the top of my head.
::Conditioning::
If you'd like to focus more on conditioning, you'd have to be pretty good at basic flourishes like fans and spreads. Beforehand, test how good they fan and how good they spread. Then, break in the deck and create a separate video showcasing whether the deck has stood up all this time, or completely died. This is all I can think of doing. Sorry for not that much input, this field is not my specialty. Ask Alex for conditioning tips
No matter what type of review style to pick, look around Youtube for samples from other deck reviewers, such as CardsRFun, deckmastercards, Yours Truly
JK.. With all jokes aside, just search Youtube for deck reviews and take what you like from them. You don't have to copy someone's routine entirely, just make it your own. That's what will draw people in and make them stay - Originality. Overall, Just Have Fun With It.