Is it possible to add the memory of graphics card in laptops?

laptop generally use integraded graphics so unless you change the part that contains the gpu, it is not possible to upgrade it, as far as i know.

only if your laptop model is a model where the gpu can be changed, and you purchase a better one that is compatible. Vram cannot be upgrade unless the whole card is changed.

Sometimes a laptop will have an option to use/share the system Ram. This is less than ideal as it makes things slower.

Mactronix