Most of the Chromebooks have one front-facing Camera. Some devices, like the Pixel Slate, might have a back-facing camera too, like other tablets in the market.
Changing Camera Resolution
If your Chromebook or Chrome OS tablet has two cameras, you will be able to change the resolution for both of them separately. Here is how you can do this.
Open the camera app and click the Gear icon on the top-left-corner:
Next, look for the camera resolutions:
You will see options to select photo and video resolutions. If you have two cameras, you will see four resolution options in total.
The available resolution depends on the camera on your Chromebook or Chrome OS tablet.
Hope you found this useful. Questions? Drop in a comment.