Watermarking - not out of the box, no. As long as you have some sort of custom module that can perform the image manipulation, it should be possible to invoke it with an Automation that handles the Media.BeforeCreate Automation Event.
Resizing - the platform already resizes images on render for the ideal size and dpi. It shouldn't be necessary to resize on upload, and it's better to allow as high a resolution as possible for the actual upload.
