Oh gosh, I had heard of Hogan's Heroes but for some reason I had been under the impression it was set in a POW camp in Vietnam (which, granted, would also have been pretty grim, and I suppose more recent to its audience). The only work of fiction I'm aware of that features a concentration camp where the story isn't strictly a straight tragedy and drama is Life is Beautiful, which I know Mel Brooks, among others, criticised strongly for trivialising the Holocaust with its tone, although it was well received by many and I haven't seen it myself and can't venture an informed opinion.