How to use SpotlightChannelCollection VideoChannelCollection in Microsoft.SharePoint.Client.Publishing to list all video channels?
I cannot find any reference about these two classes in Microsoft.SharePoint.Client.Publishing assembly.
I think this .NET Managed CSOM Video API isn't complete (yet) and there's no way to get an instance of those classes. I wasn't able to find any reference either...
If you want to interact with the Office 365 video portal programmatically there's this Hands-on lab that might help: