Let’s talk about the Elbow Plane Line (Click for YouTube Video). This line is not the fix all line but is a good reference point. If you are looking for exact you will need to line up your camera in the correct spot where the camera is hand height and perpendicular to the target line. I use it as a good enough line because my preference is to film at chest high just in front of the toe line.
Let’s take a look how I add the line. You can see in the above photo how I take the swing to impact then draw a line up form the hosel and out the back of the shaft. The reason for impact shaft line is the shaft rises from setup and the dynamic movements of the swing. When taken back to setup the line roughly goes through the right elbow (7iron pictured). I tend to have low hands at setup and always working on getting them higher and when focusing on it feel like they are on this line. Looks like I need to work on some setup pieces.
This is a general reference line that we can use to see if the club from the top is working towards the line or away form the line. Below photo I added a dot to where the club head was at the top of the swing then where it went to in transition. The left photo moved towards the line and down where the right moved away and across the ball. 
Here they are at at P6 or shaft parallel. Left going down the line and right staying above.
Here is just after impact you can see the club stay on the line on the left and the right where it came from above it went left and under the line.
A club that is traveling more along the line will usually have a stronger impact than one that is working too much form under or above. Those clubs will be producing more of a glancing blow.
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