Remove/Hide Header Background Video/Image from Single Post

I use the pofo theme for our website. I’m tryign to create an event using Modern Events Calendar plug-in. Everything wors great but when I create the post I get this annoying default header title with a background video that is on loop. I’ve tried everything to remove it so that the event itself can be push all the way up to just under the menu bar.

I assume I will need a css code to make it work, but I cannot write code. Please someone help me. It would be much appreciated.

Thank you

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