Action for opening different files

Did you try disabling or removing the open step from the action?

" because first step in this whole action is to open specific file, not to open I mean import video as layers for any file in the folder."

That is pain point. You have recorded step to open specific file which name is hard coded into action step. There are a couple of solutions for you depend on what exactly you want to do:

• Record steps to open all files you need to process in a single action: record open file1 then what you need to do with file, then record step open file2 then steps to process that file and so on...
• Second option is already sugested to you: do not record open step or delete it from your action and use, Image Processor Pro, Image Processor to apply action during batch process. Mentioned scripts will open and process all files inside selected folder so you do not need step Open which is making problem in your case.
• Third solution is to turn modal for Open step on so you can navigate and open files one by one.

Batch, Image Processor and the optional Image Processor Pro script do not require an open command in a referenced action, the whole idea is that these tools automatically open files. Note that the Batch command has an option to "override action open commands", however, I would simply disable or remove the open step from the action.

Batch actions normally do not open files unless they are adding the same image to all the files being processed.  With Photoshop Image file are batched using  features like menu File>Automate>Batch and File>Scripts>Image Processor.    The Image files that are batch Processed are opened one at a times by Photoshop Batch  feature or Scripts like Image Processor  Like Batch Images Processor can include actions you supply in the the processing.

In you Action you can insert an Menu Item "File Open" instead of recording opening a particular file.  The Open step would open the Open File dialog it would be an interactive step not a  Batch process for your interaction is required.