local preferred_webcam = "v4l2_input.pci-0000_00_14.0-usb-0_5_1.0"  

local function on_session_item_added(session_item)
  local media_class = session_item.properties["media.class"]

  
  if media_class == "Video/Source" then
    session_item:link(preferred_webcam)
    print("Linked " .. media_class .. " to " .. preferred_webcam)
  end
end

core:connect("object-added", function(object)
  if object.type == "session-item" then
    on_session_item_added(object)
  end
end)