Do you think upgrading to a dedicated graphics card will be possible?

In stock form, you will not be playing any newer games on that thing, and for upgrading it's a bit unknown since they don't list the power supply wattage (I'm guessing about 250) or any internal expansion slots that are open. Also can't tell what size and shape the tower is, it's a but custom so it may have a custom shape power supply which will be very hard to upgrade for a gaming card.

If you can't build your own system or have a friend that can help you, this would be better for a beginning for a gaming system http://www.staples.ca/en/CyberPowerPC-Gamer-Ultra-GUA540-Gaming-Computer-3-5GHz-AMD-FX-6300-8GB-1TB-HDD-AMD-Radeon-R5-230-1GB-English/product_1798626_2-CA_1_20001 It has a more standard case and the power supply should be enough to run a lower power gaming card. GTX 750 Ti would be a good fit there, although for the price you can get a quite a bit faster system if you buy the parts and build the computer yourself.