Sorry, I didn't find any videos. But honestly it isn't that complicated:
The only thing you need to check with your developers is that they provide you with a JSON Schema of the datalayer they created.
In the ContextHub configuration you have only a radio button on the top whereas the first is the option for the AEM and the second is what you need, a custom datalayer (sorry I am not able to post screenshots here for some reasons).
If you select this "Customized ContextHub Data Layer" option you are provided with a text input field where you would add "Bootstrapper._data_layer" as this is the root of your custom datalayer. Next to this field is the "</> Open Editor" Button. If you click this, you get popup window where you add the JSON Schema mentioned above.
After that you can use it exactly the same way as the AEM datalayer and you'll probably find videos on how to define data elements with the context hub extension.
Thanks for the info... I am looking for tutorials on ContextHub. All of the ContextHub videos that I found assume that the user is using AEM. We are not using AEM. Do you know of any tutorial videos that speak specifically to ContextHub without a dependency on AEM?
For pushing stuff into it, you probably need custom script elemnts in Launch.