It can be done with VMD. Use the following command vmd input.gro traj.trr  

Thank you very much

Hi Jamoliddin Razzokov,

I have run NVT ensemble and had obtained nvt.gro and nvt.trr. Are these files sufficient to visualize protein folding? What option in VMD has to be explored to observe protein folding?

first extract your protein from the trr. file using this command gmx_mpi trjconv -s prod.tpr -f prod.trr -o nojump.xtc -pbc nojump  . after that you can use the VMD input.gro nojump.xtc . after opening the protein go to Graphics and choose Representations .   Drawing method choose cartoon. Coloring method choose Secondary structure and run all steps. You can visualize changes on  your protein. DSSP tool also gives information about secondary structure evolution for each residue as well. 

Hi Jamoliddin Razzokov,

Thank you for the response.

I generated a movie file with 2001 frames (corresponding to 2ns of simulation run) using trjconv command in gromacs.  Then visualized it in VMD as you said. Can we do like this? I could see some changes in protein

In this case, you have to consider using DSSP tool. it gives information that you need more in detail. 

@ Jamoliddin Razzokov

Should I install DSSP separately?

After installation how do we interpret the results?

Yes, DSSP tool is in gromacs but don't know is it gonna work in your PC or not. In my case, it is installed in super computer facility, so I use it without any problem. When I try to use it in my PC it shows some kinda error related to executable file.