Some ICFP 2018 OCaml videos are up:
Winning on Windows: https://www.youtube.com/watch?v=1DAuSSljLFI
Wall (vector graphics): https://www.youtube.com/watch?v=bQB8kBkHxjk
Safely mixing OCaml and Rust: https://www.youtube.com/watch?v=UXfcENNM_ts
Merlin: A language server for OCaml: https://www.youtube.com/watch?v=VjLL9We1Fxc