The video, released by the French news agency Agence France-Presse, purportedly shows about 100 of the girls in a nondescript area of the bush. They are wearing Muslim headdresses, and the terror group's leader, Abubakar Shekau, declares that they have converted to Islam, reports CNN.
Shekau also says he is willing to exchange the schoolgirls for Boko Haram prisoners.
"These girls have become Muslims," Shekau is quoted as saying in the video, according to reports. "We will never release them until after you release our brethren."
While some of the abductees escaped shortly after their kidnapping, no others have been found. At least 276 girls remain missing.