You can record your game for example on your smartphone device. Of course, you also have the option to pay for a lesson with an instructor and a camera.
But consider the following…
#1 Do you want to bother some every time you want to record your hit?
#2 Are you certain that the angle of the recording is correct?
#3 Can your smart phone adjust its recording mode to make a good video even in poor weather conditions?
#4 Will you let your pitch be affected by the fact that someone is recording and watching you?
#5 How will you later use the video? Will you be later saving it or forwarding it to another email address?
It’s more convenient and carefree to swipe your ID card through the card reader, wouldn't you agree?