Is bsc (computer science) good from vit ?

Yes, it will be a good option to pursue Bsc computer science from there.

The placements, internships over there is very good. Also they focuses on practical learning which helps them in their practical knowledge.

Well,Yes Vellore VIT is good for CSE  be in terms of placements ,exposures and curriculum .You can go for it as per your conveniences .There are many other similar universities and institutes like BITS Pilani ,Lovely Professional University ,SRM etc .

B.Sc. Degree in Computer Science will help with the pursuing of AI as a specialisation in your Masters degree, but a much better way to get those degrees and so as for studying and jobs prospective is Maths. AI or Advanced Algorithms or Parallel computing or Machine Learning and Data Mining any thing in these areas need maths much more than Computer Science, the amount of CS is needed can be learned in a semester. And Fortunately it's easier to get admission in B.Sc. Mathematics. , you can Online MooCs to learn CS parts really easily.