The problem could simply be that the camera is not in focus. When taking a picture, tap the area on the screen you would like to focus on. The lens on the camera may be dirty so cleaning that would reduce blurriness. The camera itself may also be damaged and need replacement. For more information, check out the [[Xiaomi Redmi Note Troubleshooting#Section_Blurry_Camera|troubleshooting page]] for more detail and information about replacing the camera.