The video you posted uses python, which has google-made-API for its services. They maintain the API and support every feature they have. They have hundreds of programmers maintaining the python google api.
While the googleapi module in Nim is made by me, and used by practically no one except me. I only made it work for my use-case. If you are new to nim and new to google services its probably not a good project to get started with.
The sheets API has a little test example: https://github.com/treeform/googleapi/blob/master/src/googleapi/sheets.nim#L36-L46
Can you at least get your spread sheet?