Multiple output against a video

[talhaanwarch]

In some cases we need multiple labels against each video. I can create a PR for this

[fcakyon]

@talhaanwarch would be great if you could update the dataloader for multilabel data!

[talhaanwarch]

Actually, i added the features #204 , but that is based on pandas. My use case is a column with video path and other columns with labels