Update NSFrameProcessor.mm

Author: smasherprog

src/ios/NSFrameProcessor.mm

@@ -55,6 +55,7 @@ - (void)dealloc
     while(self.avcapturesession.isRunning || self.Working){
         std::this_thread::sleep_for(std::chrono::milliseconds(5));
     }
+    [self.output release];
     [self.avinput release];
     [self.avcapturesession release];
     [super dealloc];