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I've been running into the same issue. I managed to fix it partially though.

I pulled the latest opencv version of github and rebuild the framework myself after editing the following: In "cap_ios_abstract_camera.mm" edit the stop method to the following:

- (void)stop;
{
     NSLog(@"[Camera] video stopped");
    running = NO;

    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;

    [self.captureSession stopRunning];
    [self.captureSession release];
    self.captureSession = nil;
    self.captureVideoPreviewLayer = nil;
    self.videoCaptureConnection = nil;
    captureSessionLoaded = NO;
}

The only difference with the original is [self.captureSession release] which seems to "properly" clean the AVCaptureSession. Memory usage is still rising slightly on each start/stop (might even be bad memory management in the rest of my code) but not exponentially like before this fix (which resulted into a crash).

(if you're having troubles building the opencv2.framework from source, you can always have a look at a previous answer of mine.)

Hope this helps!