Benaras Hindu University don't offer the course of BCA at all. SO you won't be able to pursue BCA from BHU.

The UG courses are-

For more information regarding BHU consider the link below:

https://www.careers360.com/university/banaras-hindu-university-varanasi

For official information regarding BHU consider the link below:

http://bhuonline.in/courses.html

I hope this helps. Wish you a great eve!