Ok then so what software do you use ? - keep us all informed
Not sure if you are asking me but here goes:
For the monogram I use a free monogram builder on this web site and make sure I create it as a png file (gif is just as good - not sure if it does gif) with transparent background. Here is the site:
Free Wedding Monogram Maker By DesignMantic.com
You could then just get away with using the created monogram png file directly in Virtual DJ's powerful video engine to overlay the graphic on any video on the fly. VDJ 8.2 is my VJ weapon of choice because no other software compares for video work vs simplicity and yes I also have the full version of (Yuck) Serato DJ as I am strictly a PC user. Don't get me started on my experiences with Mac (really only because I started on PC in the early eighties and know it so well so I am firmly entrenched)
I choose to go one step further though and use a video editing program to create a video file by overlaying the monogram over-top an HD background video loop (in my case I am currently using SONY Vegas Movie Studio Platinum 13.0 as the flavour of the day to do the dirty work). Vegas Movie plays well with Windows 10 - older video editors do not I am finding. I tend to work with mp4 files only because that is the same as the vast majority of my music video files I employ. I could work with any video file type though (Yes, even *.mov). I have also used many many others video editors like Adobe Premiere as well to superimpose the graphic on a looping HD video of my choosing - my above example I simply used a flowers falling loop for the background. I then make the vid about 5 minutes long (this is arbitrary as I will then loop this in my VDJ 8.2 app onscreen). Where you do the looping to make it run as long as you want is your choice. It's really just a balance of file size and convenience....
As an example, here is an example I quickly ripped up just now. Instead of using a monogram I simply converted a well known and accessible graphic from the web (Best watched in HD):
In the above quickie example I scooped a 10 second looping star-field loop from here:
View: https://youtu.be/ci3Gwi2cNh0
(note: there are many web sites that allow you to capture download freely available HD vid clips. I have had good luck with this site:
YouTube to MP4 & MP3 Converter and Video Download )
I then got the Spock graphic from a place like here (same drill - right click the image and "save as"):
Download DJ Spock Wallpaper - Wallpapers Printed
I did an extra step here to convert the black background to transparent so you can see the star-field behind the image when it is superimposed on the video. In this case I used Paint.net which is an open source (completely free) image editor that is almost as powerful as photoshop. I love it. You can get that here:
Paint.NET - Free Software for Digital Photo Editing
Once that was done and the image was saved as a transparent background png file. I then went to the video editing software and there it is - took about 10 minutes including fiddling and adding text to the bottom....
Hope this helps?