class YouTubeChannel:
    def __init__(self, videos):
        self.videos = videos

    def get_videos(self, search_word):
        search_word = search_word.lower()
        result = []
        for video in self.videos:
            if search_word in video.lower():
                result.append(video)
        return result

# Пример использования
videos = ['Urban the best', 'Nature sounds', 'Cooking in the city']
channel = YouTubeChannel(videos)
search_word = 'urban'
print(channel.get_videos(search_word))  # ['Urban the best']