This exists already actually. Kling AI 1.5. Saw the demo on twitter two days ago, which shows a photo-to-video transformation on an image of three women standing on a beach, and the video transformation simulates the camera rotating, with the women moving naturally. Just involves a segment-anything style selection of the women, and drawing a basic movement vector.

https://x.com/minchoi/status/1862975323433795726