There's a documentary floating out there on Youtube, called The Money Masters. What is your feeling of the accuracy of this, and does it properly reflect the banking system history?
I've seen it. Can't recall the specifics but I believe it essentially skips the technical aspects of the modern era instead focusing on history leading up to the US Federal Reserve and some subsequent well known major events in an effort to raise concern about the systemic problems of fractional reserve and well known derivative issues versus the realities of globalization.
For example the fallibility of national regulators, corruption of financial institutions, challenges of post-facto manual slapdash policing versus things like HFT and off-market trading, etc.
Notably, I don't recall any mention of SWIFT or the ISO's centralized currency register.
Most of the documentaries I've seen are pretty much like that one: comfortable topics people feel are approachable and that they can easily acquire public faces to discuss. Dated enough to be out of view. Already discussed enough to be not too controversial. Often with slightly corrupting funding influences, eg. from the BBC.
As for investigative journalism at the heart of the matter, I've never seen any. While nobody can assert a complete knowledge of the current situation, there are clearly some places where digging needs to be done in the global public interest.