I noticed from the video there was no participation from the people except to receive communion.
The Latin Mass is very meditative. As far as participation, you will want to focus intently on the actions of the priest, and follow along with the Missal and readings. If you do so, you will find the Latin Mass to be very participatory.
The advice given above regarding saying the prayers with the priest is excellent advice. If you do so, you will - over time - become engrossed in the Mass, and your level of spiritual meditation will be greatly enhanced. Yes, some prayers that the priest says are silent, but you will be reading from the Missal alongside the priest.
I also agree that sitting towards the middle of the pews might help when you get started so you can take in visual cues from the other parishioners as to when to sit, kneel, etc. As you become more familiar with the Mass, you may want to move up towards the front pews so that you are not distracted by others and can really see what takes place at the altar. (Now that I have attended Latin Mass for several years, I generally like to sit in the front row as I am not distracted then by other parishioners and can really focus on the actions of the priest up close.)
As others have mentioned, your first few times attending can be confusing, so be prepared that it will take attending a few times to get acclimated. It can take several weeks, even months, to really understand the structure of the liturgy. Don’t be discouraged, but just relax and enjoy the peace and beauty of the Latin Mass.
Low Mass is offered typically during the week, with Sundays and certain feast days reserved for solemn High Mass complete with Gregorian Chant, etc. The Low Mass and the solemn High Mass are slightly different.
If you have the option to attend the Latin Mass daily, that would be the ideal as you will become accustomed to the Latin Mass rather quickly. I hope you enjoy your first Latin Mass.