Default Question regarding back up

Hi all, I am Hektor Konomi. I bought a Samsung Galaxy Core8262 cell phone before 4 months. Today when I was formatting it, I lost all my contacts, images and videos saved in it. By mistake, I forgot to keep back up of all above things. Is it possible now to have access to all my contacts and videos. If possible , please tell me.

Thanks
Hektor Konomi