I understand. I do that too while shooting star trails with my Canon 60D, since I do not want any time gap between photographs and my Chinese intervalometer introduces at least 1 second delay.Hi Yogesh,
Nadeem is shooting continuous locking down the shutter on his remote. This way even the best of the camera barring selected top levels like D5 and 1DX will fill the buffer. D3200 is the lowest in Nikon DSLR range and with low buffer and processor.
Since each exposure is several seconds long, camera should have enough time to write the image onto even the slowest card and my 60D continuously writes to the card.