Bears can sit around a site for hours before they hit it. Your camera is only catching a small piece of what's going on around your bait. One thing I would do is bait early in the day, preferably right before sun up. This gives the bear a little urgency to hit the bait before someone else does, giving lots of daylight for that to happen in. Getting some bear scent out can help too, sow in heat is a good one, gives them the impression there's more bears around and makes them more apt to come in during the day.
Good luck!
Good luck!