provide different videos on the web page

I need your help with the design problem.

I make videos. I want to provide different videos on the web page,kind of like a news feed. Every day it could be a different video. Or maybe the video is selected based on the IP address of the user. Or using whatever rules the server wants to negotiate.

So I want to give some html code to my customers, then those customers will include that code in their website ( such as a div block). When that code is rendered, it should reach out to a server, and the server will decide what video should be shown on the screen.

How would you design this? What code elements would you put on the website? What would you do on the backup to serve up the correct video?

Any other ideas?

Thanks