Gods, I relate to this.
My wife watches Big Boss which is like Bog Brother everyday.
My toddler has some song or the other playing all day long.
I can't put my headphones because either of the two keep talking all the time.
When my inlaws visit:
My dad in law is a media person, so he's on the phone the whole darn day.
My mom in law sing-songs her words.
My sis in law doesn't remember any song past the first two lines, so she sings the two lines whole fucking day.
I live in a hellscape of my own device.
Not really an open-source approach, but I found that irium Webcam is generally a lot better if you're just wanting to use your phone as one.
For some reason scrcpy just doesn't work well for me.