1. First, open the actual YouTube app and load the video that you want.
2. As you load the video, click the share button in it and then select "Copy URL". The URL of your video will look like this: https://youtube.be/Mhf20g3ky6A
3. So after the YouTube video URL has been copied to the clipboard, open your mobile browser (preferably Chrome) and then go to clip converter.cc
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4. Paste the URL that you copied on the given field and then convert it to MP4.
5. Once done, COPY the download link without downloading the MP4 file to your device. All you need is the link (just right-click on the download button then select "Copy link address" from the context menu).
6. Moving on, open your MX Player app. Press the menu icon at the top bar next to search and then select "Network stream".
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7. On the Network Stream dialog, paste the download link URL that you copied from the previous step. Press "OK" to confirm.
8. That's it. The YouTube video will be streamed via your MX Player app. You can just update the player settings to set the video on repeat. You can also choose to play it in the background.
This trick was a bit longer but it's fun to do (try once if you are a user of MX Player)