This gif is only an indexed version of the effect, but you can get an idea. The lines are being “hand drawn” in and at the same time you feel this shaky effect that is so cool and gives the video dynamics.
First we hand draw the object or type 3 times. You can use free hand, scan and clean, or a digital pen and photoshop. To be honest, I used the mouse directly and you can sense it, but it was only a quick trial.
Why 3 times? Well, switching between them is what will give the so cool shattering effect.
Now switch to After Effects and create a composition 9 frames long. 3 frames for each one of the three images.
Time re-mapping to loop
Then grow the composition until the desired length and add the loopOut() function (alt + clic on stopwatch) as an expression:
Finally correct a black out frame that appears on the 9th frame. By simply clicking a new keyframe right before and deleting it is fine.
There you go! It is looping!
But you would like to draw in I guess. This is when the stroke effect comes in.
Draw a mask along the picture/type. It doesn’t need to be perfect though, just rough.
Apply a stroke effect on the composition.
Asign all the masks you created to the stroke effect (it could be more than one!) and remember to clic “Stroke sequentially” so that it interprets the masks just the way you drew them.
Finally animate the “End” property by clicking a keyframe on 0% right at the beginning and a keyframe for 100% wherever you want the animation to end. See how it draws itself all along the masks?
This effect can be used on line drawings and typography that you can mask away with a path. Try changing the size for thicker strokes and play around.