wrong Webcam resolution microsoft surface 2

Hello, I'm trying to use a webcam texture with microsoft surface pro 2 with a desktop app. I can't set the resolution of the rear webcam up to 424 240 . If I'm trying with an external webcam (logitech c920) the same code can set the webcam resolution to 1280 720. How can i improve the webcam texture quality of microsoft surface 2 ? Thanks