Yes, it is possible to mount accessories on a shotgun barrel camera. Such items may include lenses, filters and other attachments that can help improve the image quality of your footage. The type and size of accessory will depend on the model of your shotgun barrel camera as some models may only accept certain types or sizes of lens and filter mounts. Additionally, you should check with your manufacturer's specifications to ensure compatibility with any accessories you are looking to attach. With the right combination of lens and filter choices, you can significantly improve the overall quality of your footage while also providing more creative freedom when shooting scenes in various light conditions or situations.