Simple way of fading in and out once with a click

I am looking for a way to fade in and out a scene with fading speed as 2 seconds. I have created a playground and the fade in works:

However in my original scene I have a dome and few models that do not fade in. Is there a better way to fade in the camera itself instead of fading in the scene? Can somebody edit in the playground as an easier way to fade in and out?

I will recommend to use a postprocess for that

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