An uncompromising documentary maker is forced to manipulate the reality he is filming in order to save his career.

This logline needs a hook.

“When he is given one last chance to make a successful documentary, an uncompromising filmmaker purposely keeps people from feeding the homeless he is filming in order to make their plight more dramatic.”

In other words, what specifically is he filming, and what specific unethical thing does he manipulate?

Adding those two elements will help draw in the reader.
Hope that helped