I am a man of age 45 and used to watch flying planes and helicopters .I was in my balcony and sunlight was in atmosphere and i was about to start my tea.on hearing helicopter sound i watched at it.I observed a big dot like shape behind tail rotor.I thought of it to be a bird for a fraction of second.But when I saw its movement was in the same path as of helicopter with steady speed and stability looked almost in sync with helicopter but distance between the two kept on increasing by small amount.It took not much time to understand me that it was not a normal thing. as helicopter was moving i kept watching it.I retracted it after passing behind tree top.As it was going away I lost its sight behind trees of park in front of my balcony.my approx co-ordinates were 28.703320, 77.150993.