it is necessary to get degree in BE for animation?

Nope. If you're good, Degree doesn't matter. First check if you're suited for Animation. Animation is an art form and a very demanding career. It has ample opportunities for the creatively talented people. Typically you should have good sketching skills to be able to make a sound career in this. No

So far nobody has offered B.E. course in animation. Animation is an extensiuon of computer science engineering and to become a good animator, concepts of software have to be understood.