In this tutorial I will show you have to get good video or pictures with a gopro (this could work with other camera with a similar case) through a window so that you do not get glare from behind the camera. I used a metal case that has a small gap between where the filter would go and the gopro. This allows a "seal" that does not allow light in from the sides if done correctly. This method works great when the glass is not at an angle but if it is then the gopro must also match the angle. Having some sort of curtain behind the camera is also a good way to help block more light out but that option is hard when using public transportation.
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https://www.youtube.com/watch?v=fAK0dxcqEH0