You need to practice solving pairs with your eyes closed. I saw a lot of moving pairs around randomishly until you recognized what to do. I mean a lot a lot.
A good example is at 1:46, the orange/green pair. You could have just done y' R U' R' U R U R', but you did three rotations and took 4-5 seconds to solve the pair. Do solves with the timer and just pause on each pair and stare at it. Note which slot it goes into, and figure out a solution without making any moves. Then close your eyes and do it. I can't stress the importance of this enough. If you keep just doing timed solves, you'll end up getting better at bad habits. Fix this now.
I'll give you some suggestions on some really bad cases I saw.
At 2:40, the red/green pair, you did a long sequence with rotations when you didn't need any:
Inverse: R U R' U2 R U2 R' U y' U R' U' R d'
Solve: d R' U R U' y U' R U2 R' U2 R U' R'
There are several good options for this case, but I think the two most common ones are:
Inverse: R U R' U' R U R' U2 R U' R'
Solve: (R U R') U2 (R U' R' U R U' R')
and
Inverse: R U R' U' R U' R' U' R U2 R'
Solve: (R U2 R') U (R U R' U R U' R')
Or, if you're a rotation away from the insert then you can do a quick setup before rotating:
Inverse: R U' R' U2 y' R' U' R
Solve: (R' U R) y U2 (R U R')
Make use of the diagonally opposite slot being free if you can:
Inverse: R U' R' y' L' U' L
Solve: (L' U L) y (R U R')
A shorter, fancy 2-gen fingertricky one:
Inverse: R' U2 R' U R U' R U2 R
Solve: R' U2 R' U R' U' R U2 R
The shortest one I know, useful for edge control when you have that one edge bad on your fourth pair:
Inverse: R U' R' U' F R' F' R
Solve: (R' F R F') U (R U R')
Orienting the opposite edge from that one:
Inverse: F R' F' D' R U R' D R
Solve: R' D' R U' R' D F R F'
Orienting the back edge:
Inverse: F D R2 U R' U' R' D' F'
Solve: F D R U R U' R2 D' F'
Whatever you want to do.
At 3:32, red/green pair:
Inverse: R U2' R U' R' U R
Solve: (R' U' R) U (R' U2 R)
or
Inverse: R' U' R U2 R' U R
Solve: (R' U' R) U2 (R' U R)
For your OLL and PLL, try to recognize the case from the L F and R sides without doing cube rotations or U moves. Also, avoid rotating the cube before and after LL algs. Turn the U layer to rotate the case to starting position, do the alg, and another U layer move after if it was PLL.