Nejib had his first acting role in Hbiba Msika (Dancer of the Flame), a film by Selma Baccar, in 1995. He then starred in Mohamed Kouka's play Madrasat Nisaa(مدرسة النساء / The Women's School), however, Nejib's best success was in the series El Khottab Al Bab (الخطاب عالباب /Many Fiancees) appearing in both volumes 1 and 2 (1996–1998) for the director Slaheddine Essid.
Nejib Belkadhi began his career in directing during 1998 on the TV network Canal+ Horizons, covering the Carthage Film Festival, before creating the network's most successful TV show: Chams Alik (شمس عليك ), whose concept revolutionized the Tunisian TV scene. He conceived, produced and co-presented the show from 1999 to 2001.
In 2002, he founded Propaganda Productions, with his friend Imed Marzouk, and in 2003 he directed and produced a socio-critical fake reality show called Dima Lebess (ديما لا باس /Always fine), which was broadcast on the Canal21 TV channel.
He directed his first movie in 2005, a short film called Tsawer (تصاور/Pic), with a screenplay of Souad Ben Slimane.
VHS Kahloucha (2006), his first feature documentary film, was screened to great acclaim at international film festivals, including Cannes (2006), Philadelphia (2007), Sundance l (2007) and Dubai (2007), and it was his most successful work to date.[3]