Youtube Embedding stuff expert here?

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Hi
Well I try to make a small site who show only Youtube Channels as a fancy way for bookmarks. I dont like to signup there and normal bookmarks sucks. So I got a domain for less than nothing and upload a html file. Well that works until I had so much channels and loading i frames that the browser start to lag.

Is there some easy was to make it like here where I must click to load the no cookie iframe: https://www.rtl-sdr.com/frugal-radio-monitoring-vhf-airband-aviation-frequencies-at-the-airport/ ?

And I have hundret of youtube links can i make somethink like a template for the player load think? What do I need a css file?

Thanks