Seems to be in a Mandingo language, according to a comment beneath the Youtube video.
Translation (by Youtube user Julien Bayili):
Be courageous my son don’t let people laugh on you when everything comes difficult don’t give up be hard worker, don’t let enemies rise up on you, my son be courageous nothing is easier be hardworker my son, whatever you possess keeps it up otherwise you will be in enemies quotidian
I believe it is a song of self reliance