-Once you are familiar with and familliraise wth LabVIEW and examples then you can start with Vision:https://zone.ni.com/reference/en-XX/help/370281AC-01/ and search for the inbuilt examples that come with LabVIEW.
-It will be useful for you and the community to help you better if you explain your question along with few images and VI where you are stuck with.