How to add blazor to existing ASP NET Core Applications?

Default template for Blazor Server-side creates a single page application using razor components.
the problems is in most cases thats not what we want.

Usually you have an already existing application (in this case a razor page) and you want to add some features using blazor.

[rexxon]

You save me days of googling to make this work, thanks for the video, it really help.

[shubhankarpaul]

THANK YOU SO SO SO MUCH YOU SAVED MY !!!

[lemonade]

The component shows with no CSS style. Did I missed something ?

[johns]

The video missed how to route to components. With what you demonstrated you still can't navigate to components that have the @page directive. Like @page "/mycomponent/{somePara}".
So "half-arsed effort"