Can we remove assets from the project at runtime?

I have an intro video and, as there's little chance of anyone watching it more than once, I was wondering if there's a way to remove the asset from the project and free up space, especially for the mobile version.

 

You can include the asset in an AssetBundle, and assuming that is your project's only AssetBundle, you can delete it using ClearCache. If you are using several AssetBundles then you won't want to do that though. I don't believe there is a way to delete individual AssetBundles right now.

https://docs.unity3d.com/ScriptReference/Caching.ClearCache.html

You could also load the asset at run time from StreamingAssets and just delete the file(s).