so I wanted to remove a part of the video itself not removing a clip from it if you know what I mean, like making to horizontal black bars on the top and bottom or something similar I wonder if someone could tell me how. I am using Adobe Premier Pro CC 2015.
The specific effect you are referencing is CROPPING, which logically affects ASPECT RATIO in the context of FILM FORMATS.
Along those lines, the "widescreen" format that many associate with cinematic imagery originally came from the use of anamorphic lenses (which resulted in a characteristic anamorphic aspect ratio.
Anamorphic lenses impart more than just an aspect ratio to the image, but that's beyond the scope of this answer. Nevertheless, because people have become used to viewing video in this "widescreen" format, it's become popular to clone this effect on YouTube videos etc.
If you are going to do this I would recommend changing your timeline aspect ratio rather than using a "crop bars" overlay on a normal 1080p ratio for example.
This is because people on widescreen monitors or mobile devices in landscape mode will be able to view the video using the screen's entire real estate. If you use the "crop bars" overlay then they will get a smaller image.
The 2.4:1 aspect ratio is a common widescreen format. A 1920 x 800 timeline setting gives the anamorphic appearance nicely. (Using horizontal dimensions divisible by 8 or 16, which both 1920 and 800 are, make for more friendly encoding of macroblocks used by H.264 and H.265.) On platforms like YouTube, the crop bars will automatically be added for normal 1080p display purposes.