Q: "A young man performing a bicycle stunt on a very small platform, while another is spotting him." Does this mean that "The man is riding a BMX bike."?
A: it is not possible to tell

Q: "a boy in a black t-shirt and blue jeans is pushing a toy three wheeler around a small pool." Does this mean that "A play is playing outside."?
A: yes

Q: "Two large dogs bound through a field." Does this mean that "Two large dogs outside."?
A: yes

Q: "a child sitting with a stuffed toy on a couch" Does this mean that "The child is on the furniture."?
A:
yes