GPUImageVideoCamera: the delegate shouldn't be retained
GPUImageVideoCamera: the delegate shouldn't be retained

Retaining a delegate doesn't follow the usual pattern of delegates and thus could result in a retain cycle. I have changed the delegate to be __unsafe_unretained.

Signed-off-by: Karl von Randow <4c8060af93345c2cc416ee6aa55bceec4e5cc9d4@xk72.com>

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