If I ate only vestige slimming capsule could I lose weight?

Only using a slimming capsule will not help you to lose weight unless and until you are not doing any physical activity following the calorie deficit personalized diet. And your diet should be planned in such a way that it is calorie deficit but not the nutrient deficit. In weight loss diet  itself plays a very important role followed with some of the physical activity (20- 30 mins/ day).