Your post has been translated to English as this is an International forum, please post any replies in English and it will be easier for me and other users to assist you.
Could you please elaborate your question a bit? Are you able to open the camera app at all? Do you receive any kind of error message while using the camera and if so, what does the error message say?
A good way to start the troubleshooting is to clear data for the app. This will reset all settings for the application which might do the trick. In order to do this, Find and tap Settings > Apps and notifications > App-info > Camera > Storage > Clear data > Restart the phone.
Please return with this information and we will help you as best as we can!