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HtmlAgilityPack
Html Agility Pack (HAP) is a free and open-source HTML parser written in C# to read/write DOM and supports plain XPATH or XSLT. It is a .NET code library that allows you to parse "out of the web" HTML files.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Then you can use the System.Diagnostics.Process class to kick off other programs. Specifically, you can use it to open your web browser to the desired website. Then you can also use it to launch, say, OBS Studio to start a screen recording/stream via its command line arguments.
To check the website element, you can use something like HtmlAgilityPack to occasionally hit the site source and read the element value.