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The app crashed when running the SetupAVCapture function.

To fix, replace:
self.videoDataOutputQueue = dispatch_queue_create("VideoDataOutputQueue", DISPATCH_QUEUE_SERIAL);

With:
dispatch_queue_t temp = dispatch_queue_create("VideoDataOutputQueue", DISPATCH_QUEUE_SERIAL);
self.videoDataOutputQueue = temp;

Hello.

Please include a project LICENSE file in your project stating under what license the project is released. http://choosealicense.com/ can help you to choose an Open Source license.

How to capture the photo with mask? I tried my level best but can't find a solution.

The method videoPreviewBoxForGravity:frameSize:apertureSize: should return a video box with a negative x/y origin when the videoBox width/height is greater than the frame width/height!

Here's the fix!
(Lines 175-185 in DetectFace.m)

    CGRect videoBox;
    videoBox.size = size;
    if (size.width < frameSize.width)
        videoBox.origin.x = (frameSize.width - size.width) / 2;
    else
        videoBox.origin.x = -(size.width - frameSize.width) / 2;

    if ( size.height < frameSize.height )
        videoBox.origin.y = (frameSize.height - size.height) / 2;
    else
        videoBox.origin.y = -(size.height - frameSize.height) / 2;