I’ve used Photoshop to spot film scans. It’s really one of the best tools for painting in video, the toolset is very deep and sophisticated. If you’re looking for something to “work like Photoshop”, and you already have it, then it’s a no-brainer.
Photoshop Extended can import QT movies or image sequences, you can use the regular paint tools very much as you would with still images, plus you can “onion skin” to see what you’re painting and cloning from and to, plus you can clone from one frame into another frame. You can even use PS filters on individual frames or sequences.
It’s a bit too much to cover here, but it’s covered in the PS manual. I’d recommend you use a Wacom tablet and pen.
Arnie
Post production is not an afterthought!
https://www.arniepix.com/