Here ,for example, is one of the 200m final in Kazan with title in Russian and commentary in Spanish:
I know the female commentator's voice well, but I'm afraid I don't know her name. I expect she's an ex-international swimmer as most commentators seem to be.
It looks as though nearly everything form Kazan is available on this channel.
P.S. At first glance it looks that way but many videos are blocked because of violation of FINA's copyright.