Population: One is a surreal piece of eighties video art, rather than a film, directed by Rene Daalder and released in 1986. It featured artist and lead singer of LA Punk Band the Screamers Tomata Du Plenty as himself. The last survivor of a nuclear war – or the sole survivor of a mass suicide pact, as he puts it. He offers a psychedelic and surreal history of the USA told through song and featuring himself and Sheela Edwards.
The imdb page is here.