Studying the African kingdoms of Ghana, Mali and Sonhay?
Here are a few video resources.
Here's a terrific two minute clip on the rise of Ghana.
And here is a TedEd talk by Jessica Smith about Mansa Musa and his enormous wealth.
Here is the Legend of Timbuktu (about 12 minutes) from MNM Television Network.
Finally, here is a 7 minute clip on the he Swahili Cities of East Africa.