My right side rear lights stopped working . Can any one please say what would have happened this is for Nissan almera car.

Try replacing the bulb--it likely burned out.

The bulbs are new. Is there any fuse for these rear lights

Check all under hood and under dash fuses with a test light or multimeter:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post252145