Can we put graphic card on laptop

Some laptops come with aftermarket cards, it depends on the model.

Generally speaking, no you can't, most laptops can't have their graphics capabilities upgraded. There are a few laptops that can, but those are the more expensive ones, typically selling for $1500+. There are external devices that allow you to connect a desktop graphics card to a laptop using an ExpressCard slot. However, the bandwidth this gives you is quite limited and most graphics cards will be severely bottlenecked with such a setup, leading to rather poor performance.

98% of laptops cannot have their video card updated.

Only certain expensive gaming laptops have that option.