Normally osprey, like peregrines, do not like humans anywhere near - though, as we have seen through watching Tracy do bandings and Kyle's rescue, they will tolerate human intervention that does not seem to threaten the young.
In the previously linked video, Stoop (the star of the video) was actually one of three juvenile osprey that were orphaned. A rehab group, like those associated with the peregrines, took in the babies and were raising them to adulthood. Presumably they would help the osprey learn how to hunt and survive before being released back to the wild.
BTW, one of the people speaking in the background was cautioning that she might take a chunk out of the feeder's hand (the guy with the medical clamp). Sounds like an early, built-in protection instinct to me!