core/homeassistant/components/agent_dvr/icons.json

{
  "services": {
    "start_recording": {
      "service": "mdi:record-rec"
    },
    "stop_recording": {
      "service": "mdi:stop"
    },
    "enable_alerts": {
      "service": "mdi:bell-alert"
    },
    "disable_alerts": {
      "service": "mdi:bell-off"
    },
    "snapshot": {
      "service": "mdi:camera"
    }
  }
}