Is it possible to driver two parallel MOSFET by using single optocupler (TLP250)?
It is possible. It is advisable to a resistor in series with each gate to help avoid oscillations.

Careful PCB layout is also a must - keep the source inductances matched and as low as possible. Put the MOSFETs as close together as possible, wire the sources together with as short and wide track as possible and connect to your gate driver at the mid point of that track.