I have done my 12th with computer, graphics and animation. Am I eligible for BCA?

Yes, you can pursue BCA. The eligibility criteria is different for every university. The general criteria is that a candidate needs to score at least 45% in +2 in order to be eligible for admission into BCA. Some universities also require candidate to be from mathematical background and then provide

The general eligibility criteria to be eligible for applying for BCA course you must have completed your Higher Secondary (+2) Examination or equivalent (Diploma degree), with minimum 50% marks in total and also having Mathematics as subject in the qualifying examination.