How can you break the camera free in League of Legends?

I've seen a lot of clips like this on youtube

I really, wonder; LoL has a pretty much locked camera. You always will see the game from the top.

So how can you 'break the camera free' so you can have shots facing the character?

Important thing to remember: This seems to be the replay of a real game, not somebody who ripped assets and animated it's own thing.

This can only be achieved through 3rd party software. A tool I've stumbled upon a few times is the Creator Suite which might be the most popular (and trustworthy) one.

It's released by SkinSpotlights (a popular League youtube channel). Here you can find a tutorial on how to use the tool and there also exists a community ran subreddit for it.

Even though Riot usually doesn't allow any use of 3rd party software, this is one of the few exceptions. There are a ton of content creators that utilize these tools and Riot Games themselves sometimes have LCS montages with altered camera angles (this might be an internal tool though).