This is more of a problem for countries that use the PAL system, but when you are filming you can get flicker on screens and projectors. This is really annoying and most often I come across this issue when I am videoing or live streaming a conference. There are things you can do to reduce it or get rid of it. If you have a dedicated video camera then you might have a setting like on the Canon video cameras that allow you do dial in the frequency. You can try changing the settings to NTSC if it lets you and also changed the shutter speed to 1/60th of a second. This might have to do if you can’t dial in the frequency.
For this video I used the Osmo Pocket 3, the DJI Mic 2 and also the Atomos Ninja V to record what I was going on the camera.