Is it possible to have screen displaying with exactly only CPU [closed]

You cannot output to a physical display without some kind of GPU. The GPU includes the hardware necessary to scan through the display frame buffers and output a signal that a monitor can understand.

If you do not need a physical display though, a GPU is not technically needed. The CPU is capable of drawing a window and doing the desktop composition necessary. Technically speaking this is what is going on when you run a virtual machine (or qemu emulated machine) and do not enable any hardware video acceleration.

You can still connect to that virtual machine via a remote desktop app and see a display.