There were many startling facts about the occurrence in this footage. Bobby and Violet chose Washington Square Park for their territory. The park is not that large and is often heavily populated with people. As such, Pip does not have much room to navigate as she learns to fly and hunt and feed in the park.
In this case, Pip had to land mere feet from people seated on the grass in order to reach her meal. Pip was noticeably anxious about the large number of people (about a dozen) who suddenly converged near her in order to take photos and video and otherwise stare. Pip did eat her whole meal and flew away immediately afterward.
Pip is a wild animal in a heavily-populated city. You can't blame people for being curious and thankfully, she was not endangered in this instance but I for one resolved to observe her from a further distance from now on.