findNonZeroAsync function
FindNonZero returns the list of locations of non-zero pixels.
For further details, please see: https://docs.opencv.org/master/d2/de8/group__core__array.html#gaed7df59a3539b4cc0fe5c9c8d7586190
Implementation
Future<Mat> findNonZeroAsync(InputArray src) async =>
cvRunAsync((callback) => cffi.core_FindNonZero_Async(src.ref, callback), matCompleter);