Don't fail ptz if camera does not support relative zoom (#7542)

* Remove relative zoom space as it is not used

* Catch case where camera does not support relative zoom

* Cleanup

frigate/ptz/onvif.py

@@ -104,9 +104,15 @@ def _init_onvif(self, camera_name: str) -> bool:
             move_request.Translation.PanTilt.space = ptz_config["Spaces"][
                 "RelativePanTiltTranslationSpace"
             ][fov_space_id]["URI"]
+
+        try:
             move_request.Translation.Zoom.space = ptz_config["Spaces"][
                 "RelativeZoomTranslationSpace"
             ][0]["URI"]
+        except Exception:
+            # camera does not support relative zoom
+            pass
+
         if move_request.Speed is None:
             move_request.Speed = ptz.GetStatus({"ProfileToken": profile.token}).Position
         self.cams[camera_name]["relative_move_request"] = move_request