I didn't watch your video as my pain tolerance isn't as high as it used to be.
With that having been said I did look at your match/ranked history and it's clear that you shouldn't be blaming your teammates at ALL, period. Where do I even begin... okay, here are a few things that might help you...
- Stop playing Zed. You have a 23% win rate and a grotesque K/D/A. It is obvious this is not your champion, so stop.
- You die wayyy too much in games. Frequently you're in to the double digits in terms of deaths (10 or more) and that is a sign that you're doing something very wrong
- Your CS is terrible... not even marginal or passable, but flat out Bronze V. You need to farm more.
- You barely ward. The first game in your ranked history is a SION support game in which you warded 12 times for the entire game. A 35 minute game and you only warded 12 times... think about that. That's just about one ward every three minutes... wow. Other games you ward even less, how do you even play without vision of the enemy?
Practice your champions. Play some bot games, use the practice tool, maybe try a few normals, keep refining your champions, but for the love of God, stop playing ranked---it is only going to be a source of frustration for you because you aren't ready for it, clearly.
Sorry to have to be so blunt but that's just the way I see it.