Q: "A baseball player swinging a bat" Does this mean that "Someone is swinging a bat."?
A: yes

Q: "A person in jeans and a blue sweatshirt aims a camera while standing near a crowd of people." Does this mean that "a cameraperson aims near a group"?
A: yes

Q: "A guy and two girls are smiling at the camera." Does this mean that "Two girls are smiling at the snail."?
A: no

Q: "a big white dog jumps on a small dog." Does this mean that "A white dog attacks a smaller dog."?
A:
it is not possible to tell