Can i use MOSI/MISO pins from this schematic
FTDI/ICSP programmer? Arent that two different things? FTDI use rx and tx pins, while Atmega ICSP will need your SPI pins.

Anyway, if you are trying to use SPI (miso, mosi, clk, cs) pin for flashing the ATMega (ICSP), that will work. Consider that most SPI based arduino shield - ethernet shield W5100 for example, use these pins (just like your 7 segments) and yet the arduino can still be flashed using the same pins.

Remember that to use ICSP, you will need MOSI, MISO, CLK, and RESET pin as well as vcc gnd to power up the atmega