Is it difficult to interview at Hikvision?

Of course. First of all, capabilities are different in different periods. Secondly, companies have different needs for personnel. Some companies really recruit people, while others are looking for backup personnel for reference when needed, so failure cannot represent success. If the company doesn't approve of it, it may just use you as a backup person. They don't need anyone at the moment. And people need to keep trying. Only if you try, you will have a chance. But on the contrary, if you don't try, you will never have a chance.