How can I get the image camera for ios?

Hi, i'm trying to get ios camera feed as the background texture. i did some research and found we can use WebCamTexture to get the camera texture.

But when i run the app in ipad, i found that the camera is in "video mode", not "image mode". That means, the texture i got is much narrower than which in "image mode". I want to get the texture in image mode. Can i achieve that in Unity? Thanks