In normal case, a convicted person's passport could be seized as per the order of the trial court or the appellate court. If conviction period is over , there is no problem in geting back the seized passport except in some particular offences connecting economic and foreign laws.
If the conviction is sustaining and appeal is pending before the appellate court, apply to the court by giving all necessary particulars for going abroad is very much necessary and unavoidable. If court satisfied with your requirement to go abroad, court will permit you to go abroad on certain stringent conditions. High court can also pass such order upon its descretion. first thing you have to remember is that you can satisfactorily explain your urgency and emergency before the court to get the seized passport temporarily. Feel free to ask quories.