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Since you do not know the logo beforehand, the problem cannot be solved easy. What you could do is look for regions in the video where no difference exists between different frames of the video input. Since a logo is mostly fixed at a certain position in the video, this would give you possible interesting regions.
Then in that region you can apply multiple approaches: 1) Template matching using that logo if the situation provides it - adaptable for each new logo 2) Perform OCR on the region and maybe try to extract text - save texts to file and later select which text is interesting depending on characteristics.
Just some suggestions, but I would suggest to first define better what you actually want, since detecting any object, with no prior information is kinda impossible I guess. You will always have to give some input.
