I've tried to play .mov file in VLC. It is just a black screen. I can hear audio.
Any suggestions how to successfully play video?
Software decoding is, except for MPEG-2 and VC1, way too slow and unwatchable on a Pi. I wouldn't recommend it. I would recommend converting to a different file format as above. There is no difference between MP4 and MOV file formats, because they are just containers for H.264 or H.265. Thus, from the Pi's perspective, this won't do anything.
Quite possibly, but he would see more than a black screen with audio
The codecs are the same, but the format is different. Mpeg4 in a mov container is non standard.