Hi, You can use cordova camera plugin, you can refer to one of our blog:
How to use cordova camera plugin

If you want to send image as base64 string you can change destination type to Camera.DestinationType.DATA_URL and you can send imageData to server via ajax call.
or, if you want to send as file array then keep the same destination type to camera.DestinationType.FILE_URI and use cordova file plugin to send file data in server:

            var options = new FileUploadOptions();
            options.fileKey="tickitFile";
            options.fileName=imageData.substr(imageData.lastIndexOf('/')+1);
            options.contentType = "multipart/form-data";
            options.chunkedMode = false;
            options.mimeType="image/jpeg";
            options.httpMethod="POST";
            options.headers =   {
                                    Connection: "close"
                                };    


            var ft = new FileTransfer();


            ft.upload(imageData, PHP_URL, win, fail, options);
            function win(r) {
                console.log("Response = " + r.response);
                   console.log("Sent = " + r.bytesSent); 
            }
            function fail(error) { 
                console.log(JSON.stringify(error));
            } 

Hope this will help you.. :)