Yes I've been putting on my hips as well. It really does make the hips look fuller.
No, it will not add volume to your hips or buttocks. Surgical procedures such as a gluteal augmentation via fat transfer or implant placement will add volume to volume deficient areas. Skin "oils" creams and "serums" will not add volume. Be sure you have an in person consultation with a Board Certified Plastic Surgeon who you meet, understand and trust before undergoing any surgical procedure.