HOW TO: Blur and glow in AE

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In general, I did the animation of the shape, and now I need to add this effect as in the video https://youtu.be/XWw6sxAQYDY?feature=shared , I tried to add blur and glow, but they went beyond the boundaries of shape 1 (I created two shapes: shape 1 and shape 2, shape 1 is the main animation and shape 2 is trail, and blur and glow 2 trail shapes went beyond the boundaries of 1 shape). Can you tell me how to make sure that they do not go beyond the borders? 

[Mylenium · Accepted solution]

Apply additional track mattes based on duplicates of layers.

Mylenium

[??????_4118]

I tried, but it didn't work, glow is still out of borders

[??????_4118]

Thank you so much!