Can I watch my wedding video which has music during Sefira?
The purpose of not listening to music is in order to conduct ourselves in a state of mourning due to the terrible tragedies that occurred to us during these days of Sefira.
This is even if the music is recorded and not live. This is especially true in such a case where watching the video will bring extra joy. Therefore, the video should not be watched if the music will be played.
See Aruch Hashulchan (Orach Chayim 493:2). Igros Moshe 1/166; 3:87. Minchas Yitzchak 1:111.