There are tons of videos of people live coding on Youtube/Twitch but I find the majority of them often work on problems relatively trivial, do not explain their thought process very well or just don't write easy to read/modular code. Some examples of what I'd consider very high quality streams:
Hacking with Andrew and Brad: an HTTP/2 client [0]
Porting flamegraph to Rust [1]
[0]: https://www.youtube.com/watch?v=yG-UaBJXZ80 [1]: https://www.youtube.com/watch?v=jTpK-bNZiA4