Video labelling

I am currently working on a deep learning project that involves video processing. I have manually collected the video dataset which is unannotated. After lots of research I haven’t yet found any method for labelling videos. I could convert these videos into images and label them one by one. But these images count upto 500,000 and practically it isn’t possible for me to do so. Please do tell me if there are any alternatives for labelling video dataset or any automated labelling process that doesn’t cost you bucks. I’m new to Deep Learning as well as the community, so please do forgive me incase of any errors.