Counterexample of a non-boring "live" coding demo (OK, it is recorded and played in a faster tempo): Some of Bisqwit's videos. Some of my favorites:

OpenGL programming, simple FPS style walking scene (DOS, 256 colors, dithering, OSMesa): https://youtu.be/vkUwT9U1GzA

Creating a MicroBlaze emulator in C++11 (runs Linux!): https://www.youtube.com/watch?v=1e0OCwlaEZM

Tandy 1000 Soundchip revisited: ASM programming example: https://www.youtube.com/watch?v=gjuHxjdv3ZE

Creating a DCPU-16 emulator in C++11 [here Bisqwit also gives oral explanations]: https://www.youtube.com/watch?v=MvDtr3cNaLU