HoloLensで顔検出やってみました。 ref: http://qiita.com/miyaura/items/85f53b13c71983e8ced2

CameraScript.cs

// Copyright(c) 2017 Takahiro Miyaura
// Released under the MIT license
// http://opensource.org/licenses/mit-license.php
public override void DetectFace()
{
    AppCallbacks.Instance.InvokeOnUIThread(async () =>
    {
        var properties =
            _capture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview) as
                VideoEncodingProperties;
        if (properties == null)
            return;

        //coution! face detect is only supported 'BitmapPixelFormat.Gray8'.
        var videoFrame = new VideoFrame(BitmapPixelFormat.Gray8, (int) properties.Width, (int) properties.Height);

        this.FrameSizeWidth = (int) properties.Width;
        this.FrameSizeHeight = (int) properties.Height;


        var previewFrame = await _capture.GetPreviewFrameAsync(videoFrame);

        var detector = await FaceDetector.CreateAsync();
        var detectFaces = await detector.DetectFacesAsync(previewFrame.SoftwareBitmap);
        var faceInformations = detectFaces.Select(x => new FaceInformation
        {
            X = x.FaceBox.X,
            Y = x.FaceBox.Y,
            Width = x.FaceBox.Width,
            Height = x.FaceBox.Height
        }).ToList();
        AppCallbacks.Instance.InvokeOnAppThread(() => { OnDetected(faceInformations); }, false);
    }, true);
}