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The answer is yes! I found similar code on SO to this which did the job just fine:

 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *directory = [paths objectAtIndex:0];
NSString *filePath = [directory stringByAppendingPathComponent:[NSString stringWithFormat:@"hand%f.jpg", CFAbsoluteTimeGetCurrent()]];
const char* filePathC = [filePath cStringUsingEncoding:NSMacOSRomanStringEncoding];

const cv::String thisPath = (const cv::String)filePathC;

//Save image
imwrite(thisPath, capturedFrame);