Rubuta ci gaba don wannan sakin layi - an haifi Vukmirović a ranar 1 ga Agusta 1912 a garin Bratsigovo na Bulgaria. Mahaifinsa, asalinsa daga garin Montenegrin na Rijeka Crnojevića, ya shiga cikin Ilinden Uprising
a shekara ta 1903. Bayan da aka murkushe tawayen, an daure Nikola a Daular Ottoman daga baya ya koma Bulgaria inda ya auri Stojanka wanda ya haifi 'ya'ya maza uku: Boro, Andro da Rade. A cikin 1914, dangin suka koma Peć inda Boro ya kammala makarantar firamare da aji shida na makarantar motsa jiki. A wancan lokacin, makarantar motsa jiki ta Peć tana da maki shida kawai kuma dole ne a kammala ilimi a Prizren wanda iyayensa ba su da kuɗi. Bayan kammala aji na shida, ya sami aiki a matsayin ma'aikacin aiki. Ya yi aiki a Peć da sauran wurare a Kosovo.