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# delegateCallbackQueue

The dispatch queue on which all [`AVCaptureBroadcastVideoOutputDelegate`](/documentation/AVFoundation/AVCaptureBroadcastVideoOutputDelegate) methods will be called.

```
var delegateCallbackQueue: dispatch_queue_t? { get }
```

## Discussion

The value of this property is a dispatch queue on which all delegate method calls will be serialized. If you have not called the [`setDelegate(_:queue:)`](/documentation/AVFoundation/AVCaptureBroadcastVideoOutput/setDelegate(_:queue:)) method, the value of this property will be `nil`.

## See Also

[`delegate`](/documentation/AVFoundation/AVCaptureBroadcastVideoOutput/delegate)

The receiver’s delegate.

[`-  setDelegate:queue:`](/documentation/AVFoundation/AVCaptureBroadcastVideoOutput/setDelegate(_:queue:))

Sets the receiver’s delegate and the dispatch queue on which the delegate will be called.


---

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