Decode a NV12-encoded image to a uint8 tensor.

contents A Tensor of type string. 0-D. The NV12-encoded image.
size A 1-D int32 Tensor of 2 elements: height, width. The size for the images.
name A name for the operation (optional).

A Tensor of type uint8 and shape of [height, width, 3] (RGB).