You can sort-of "clean" whatever output you get from your camera because the symbols are typically around the periphery. Adjust focus+zoom so that your subject

You can sort-of "clean" whatever output you get from your camera because the symbols are typically around the periphery. Adjust focus+zoom so that your subject is within the rectangle that doesn't have symbols, take the camera output and put it through OBS with a crop filter and you've got something that's clean.