Some very promising projects that are re-colorizing old photos and videos.
A project called De Oldify has shared some very impressive results.
DeOldify is a state of the art way to colorize black & white images. You can try it right now by visiting the free Google Colab notebook for photos or video. The notebooks are open source, and available to all.
https://deoldify.ai/#about
And another project at Neural Love has some impressive videos.
We do video upscalingOur machine-learning masterpiece is built on top of an ensemble of neural networks that can upscale, add FPS, colorize, remove noise and much more
https://neural.love