Check if the autoplay has been allowed

Question

I’m working on a website that at home, has a background video and a carousel of text on top. I would like to, instead of trying to cheat the browser and force the autoplay, to upload a background image. I’ve tried putting a <p> within the <vídeo> to test, but it doesn’t work, I think because the browser understands what source is there, it just wasn’t activated.