There are currently two videos about Salsa available, but they describe an older version of Salsa and so they are rather outdated:

  • How Salsa Works, which gives a high-level introduction to the key concepts involved and shows how to use Salsa;
  • Salsa In More Depth, which digs into the incremental algorithm and explains -- at a high-level -- how Salsa is implemented.

If you're in China, watch videos on How Salsa Works, Salsa In More Depth.