As long as she respects that video games is one of your me time leisure activities I don't see it being a problem. Indeed I don't even think you need to talk about it. It will be pretty clear pretty soon if she disrespects this aspect of your life. It's then up to you to decide if that's a deal breaker or if you are willing to sacrifice video games for something bigger and better.
Personally I'd give up video games in a heart beat if I really love her.
There is no harm in saying to yourself "If I love her I will do (or not do) X".
What is harmful is for one of you to say "If you love me you will do (or not do, or let me do) X".
Put conditions on yourself, don't put conditions on her.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
