How is he jumping at the people/you?
My Marmalade and LuckyDuck will jump out at me to initiate play.
LuckyDuck jumps out quickly and stops in an 'aggressive stance'; a little sideways-on to me, head/tail up, ears forward, feet wide apart, paw toes a little extended to grip the carpet for a fast get-away and eyes wide open. I always give a little "Eek!" and jump a little (on purpose) to make him think he is a great hunter, then I pet his head and tell him what a scary cat he is. Sometimes, if I don't acknowledge him he will swipe a paw at my pant-leg.
Marmalade will run sideways towards me with his head/tail up, ears a little back and he will make a little 'cry' noise to get my attention. Sometimes he just runs up towards me and then skitters away, still in this 'play' mode. Sometimes he will run towards me and instead of scooting away he will stand on his hind legs and wave his front paws at me while he makes his 'cry' sound. It is sort of like: "Meeaaaar!" If I reach to pet him when Marmy is in this 'play' mode, he will grab me with his front paws or give a firm bite. If I crouch down a bit and show him "claw hands" he will scoot off and then come back to confront me again with his fearless demeanor.
That is how two of my cats play with me. How is your cat behaving when he does this? Is he initiating play or expressing annoyance at the attention he is being given? Maybe you can get an interactive toy to use to play with him. I like laser dots for them to chase, leather strings because they don't get caught in teeth/claws or feather toys like Da-Bird. You need toys you can play with him and still keep your body parts out of range of his teeth/claws.