Im new to this and need ur help….. i just wanna know what this is called and where i could find a good one ..im sorry if not knowing abt it looks dumb

Go pro almost electronic stores sell them

Looks like some random GoPro mount on a stick that that person somehow rigged to the handlebars, stem or headset. I don’t think this is some cycling-specific stick.

Think articulating selfie stick and zip ties as a starting point.

No worries. Hope you have fun and stay safe out there