The following is a very informative documentary from 1979 about ZANU-PF, Robert Mugabe and Zimbabwe’s national liberation struggle. You can watch it in six parts here, or you can see it all together and at a somewhat higher quality at zwtube.com. For more information, please see the outstanding book Chimurenga! The Liberation Struggle in Zimbabwe edited by Harpal Brar, which can be purchased from the website of the Communist Party of Great Britain (Marxist-Leninist).
See also this video from a year after liberation: