increase video ram

Hi and welcome to Tom's.

Are you on a laptop? If I am right, it is not possible increase the video RAM on laptops, at least, in 99% of them. I think that the only way at this point is get a new one.
 
If your vRAM is dedicated vRAM (meaning it's a part of the GPU), then you can't upgrade it. If your vRAM is shared system memory, you might be able to.

Can you give us some specifics about your computer? Model number of the PC, which CPU and which GPU, how much RAM, etc.?