Sure - I have the Elgato pop-up green screen. You can get cheaper alternatives from unknown brands but with a product like this that I rely on daily, I feel more comfortable knowing that is made by a company who is willing to put their name on it and who is know for making good-quality products. The mechanism is smooth and sturdy and the fabric is good thickness with low gloss/reflectivity to give an even green colour, even with poor-quality lighting. I also like the fact that it is quick and easy to set-up and that it can be stowed away (relatively) discretely when I'm not teaching!

It all depends on what tablet you have. Firstly, you can try to set up screen mirroring/connect to a wireless display so that your tablet will effectively work as a second display for your computer. You can then use "display capture" in OBS and capture from this. I find this to be a very messy and fairly unreliable way of doing things, but I know that other people have some levels of success. Otherwise, see what kind of outputs your tablet has. If your tablet has an HDMI-type output then in my opinion (and the way that I do it) it is worthwhile to invest in a HDMI to USB converter - something like this: www.amazon.co.uk/gp/product/B0895N9KM5/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 There are various adapters that can help make this work. For example, I can connect my phone which has a USB-C output and convert it to HDMI using this to convert it to HDMI: www.amazon.co.uk/gp/product/B082PVXSRM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 The idea is that you connect a HDMI cable to the output of your device then plug it through this device to a USB port and it will work in the same way as a webcam which OBS will read as a "video capture device". This method should work with anything that has a HDMI output.

I believe that it's okay for you to minimize the obs page after you set them up, and open your pdf explorer. Of course buying second monitor and assign one of them as obs control display and the other as captured display will solve your problem in way better way.

Yes as long as OBS is open in the background then you can minimise and scroll your pdf document live with the desktop/window capture source. It is also possible to set up hotkeys to change scenes and activate sources in OBS so that you do not to keep maximising and minimising OBS.

There are many - this is a relatively recent study: onlinelibrary.wiley.com/doi/abs/10.1111/jcal.12397

@@MathPartner Thanks! 😀

@@MathPartner Thanks!

I haven't tried it, but yes it is theoretically possible to remove any colour in the same way that I showed removing the background from the calculator.

You should be able to activate virtual camera and then select OBS virtual camera from the list of cameras.