Agree with those saying he should not have been blocking the road, if his intent was to walk off and leave his truck there to prevent others from accessing the area. Was he still unpacking his truck when you went the alternate route?
As far as what you described about the situation, it seems to me that a smile and a 'hello' between you two followed by a civil conversation would probably have led to a nice compromise with you getting your photos that you were hunting for and him getting his deer. In my opinion, neither of you was intentionally being a 'dick', there was just no communication besides some gesturing.