The creator of Handmade Hero[0] has regular C++ streams on YouTube[1].
Jonathan Blow (creator of Braid and The Witness) sometimes streams[2] development of his language, Jai. He does write some C++ when he digs into compiler internals, but it's mostly in Jai.
[0]: https://handmadehero.org/
[1]: https://www.youtube.com/channel/UCaTznQhurW5AaiYPbhEA-KA