core/homeassistant/components/agent_dvr/icons.json

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