As Commander says, yes it is possible. How easy or hard it will be depends on your current conditioning and how disciplined you are in your diet and workouts. When you say you want to lose mass in your hips Iím am guessing you are talking about losing fat (at least I hope, b/c who in their right mind looks at their lower body and says, ďman I wish they didnít have such big muscles thereĒ). If you have a lot of excess fat there, sure you can shed some of that while building your upper body muscles. However, the fat loss will be spread throughout your entire body, not just in the hips.
"Heaven and earth shall pass away, but my words shall not pass away." - Matthew 24:35
"But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, meekness, temperance: against such there is no law." - Galations 5:22-23