 He directed some of the most popular Bulgarian films of that time, most notably "The Swedish Kings" (1968), "The Boy Turns Man" (1972), "A Peasant on a Bicycle" (1974), "Matriarchy" (1977) and the hit film "A Nameless Band" (1982).He received the Silver Prize for the film "Balance" (1983) at the 13th Moscow International Film Festival.In the 1975, Kirkov was nominated for the Golden Prize at the 9th Moscow International Film Festival for the film "A Peasant on a Bicycle".